Tasić, V., Kovačević, R., Apostolovski-Trujić, T., Lazović, I., Mirkov, N., Topalović, D., Božilov, A.,& Mišić, N.. (2023). Uređaj za merenje kvaliteta vazduha - PAQMAN 2020. in Univerzitet u Beogradu : Institut za nuklearne nauke "Vinča" - Institut od nacionalnog značaja za Republiku Srbiju.
https://hdl.handle.net/21.15107/rcub_vinar_13000

Tasić V, Kovačević R, Apostolovski-Trujić T, Lazović I, Mirkov N, Topalović D, Božilov A, Mišić N. Uređaj za merenje kvaliteta vazduha - PAQMAN 2020. in Univerzitet u Beogradu : Institut za nuklearne nauke "Vinča" - Institut od nacionalnog značaja za Republiku Srbiju. 2023;.
https://hdl.handle.net/21.15107/rcub_vinar_13000 .

Tasić, Viša, Kovačević, Renata, Apostolovski-Trujić, Tatjana, Lazović, Ivan, Mirkov, Nikola, Topalović, Dušan, Božilov, Aca, Mišić, Nikola, "Uređaj za merenje kvaliteta vazduha - PAQMAN 2020" in Univerzitet u Beogradu : Institut za nuklearne nauke "Vinča" - Institut od nacionalnog značaja za Republiku Srbiju (2023),
https://hdl.handle.net/21.15107/rcub_vinar_13000 .

TY  - CONF
AU  - Radenković, Mirjana
AU  - Topalović, Dušan
AU  - Ćujić, Mirjana
AU  - Onjia, Antonije
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12223
AB  - Renewable energy resources are of great interest for prevention and mitigation of the climate change effects. Here is presented a study on the utilization of green energy fuels derived from available resources as prevent for diminishing potential environmental pollution levels influencing this change. The atmospheric particulate matter composition, also recognized as hazardous and most responsible for human health and premature deaths would be adequate parameter to be followed in these terms. A biomass burning contribution to the aerosol fraction with particles less than 2.5 μmin diameter (PM2.5) was assessed in the Belgrade residential area. Daily PM2.5 aerosol samples collected on membrane Teflon filters over four seasons were analyzed by PIXE (proton induced X-ray emission) nuclear analytical technique and multi-wavelength (405-1050 nm) light attenuation measurements. Results have indicated presence of several biomass and biofuel related tracer elements like Ni, V, Cu, Zn, Ti, Mn, and Cr and significant contents of Pb and Cd, proving that it may be used for detection of their presence in the mix of energy related emissions. Black carbon concentration was also a good indicator candidate as its values have shown strong seasonality, although for more sophisticated recognition of specific species, additional analysis would be necessary. Receptor modeling using positive matrix factorization (EPA PMF 5.0) revealed about 40% of PM2.5 mass belonging to the biomass-related emission sources coming from the energy production sector. Besides the black carbon measured at wavelengths up to 600nm, K was recognized as a main tracer for biomass sources like wood and biofuels. A V/Ni ratio, characteristic for heavy oil burning, was noticed in all seasons indicating contribution of industrial emission sources during the summer in addition to its appearance in the heating season. Nevertheless, recently encouraged use of the individual biofuels such as biochar, bio-oil, methanol, and crude glycerol, could not be distinguished by applied methodology from the mixed ones. Use of HP Ge spectrometry for 210Pb/Pb ratio and K concentrations determination should be considered in specific cases only, due to differences in sampling periods and sample preparation procedures for radionuclides and PM2.5 elemental analysis. Obtained results support the use of nuclear analytical techniques for analysis as well as development of new tools and techniques for simple and efficient control of biofuel combustion products in emission exhausts, having in mind the intention of their more frequent application in everyday life in urban areas.
PB  - Niš : RAD Centre
C3  - RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts
T1  - Monitoring of biomass and biofuels contribution to atmospheric pollution by using nuclear techniques
SP  - 68
EP  - 68
DO  - 10.21175/rad.abstr.book.2023.15.10
ER  - 

@conference{
author = "Radenković, Mirjana and Topalović, Dušan and Ćujić, Mirjana and Onjia, Antonije",
year = "2023",
abstract = "Renewable energy resources are of great interest for prevention and mitigation of the climate change effects. Here is presented a study on the utilization of green energy fuels derived from available resources as prevent for diminishing potential environmental pollution levels influencing this change. The atmospheric particulate matter composition, also recognized as hazardous and most responsible for human health and premature deaths would be adequate parameter to be followed in these terms. A biomass burning contribution to the aerosol fraction with particles less than 2.5 μmin diameter (PM2.5) was assessed in the Belgrade residential area. Daily PM2.5 aerosol samples collected on membrane Teflon filters over four seasons were analyzed by PIXE (proton induced X-ray emission) nuclear analytical technique and multi-wavelength (405-1050 nm) light attenuation measurements. Results have indicated presence of several biomass and biofuel related tracer elements like Ni, V, Cu, Zn, Ti, Mn, and Cr and significant contents of Pb and Cd, proving that it may be used for detection of their presence in the mix of energy related emissions. Black carbon concentration was also a good indicator candidate as its values have shown strong seasonality, although for more sophisticated recognition of specific species, additional analysis would be necessary. Receptor modeling using positive matrix factorization (EPA PMF 5.0) revealed about 40% of PM2.5 mass belonging to the biomass-related emission sources coming from the energy production sector. Besides the black carbon measured at wavelengths up to 600nm, K was recognized as a main tracer for biomass sources like wood and biofuels. A V/Ni ratio, characteristic for heavy oil burning, was noticed in all seasons indicating contribution of industrial emission sources during the summer in addition to its appearance in the heating season. Nevertheless, recently encouraged use of the individual biofuels such as biochar, bio-oil, methanol, and crude glycerol, could not be distinguished by applied methodology from the mixed ones. Use of HP Ge spectrometry for 210Pb/Pb ratio and K concentrations determination should be considered in specific cases only, due to differences in sampling periods and sample preparation procedures for radionuclides and PM2.5 elemental analysis. Obtained results support the use of nuclear analytical techniques for analysis as well as development of new tools and techniques for simple and efficient control of biofuel combustion products in emission exhausts, having in mind the intention of their more frequent application in everyday life in urban areas.",
publisher = "Niš : RAD Centre",
journal = "RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts",
title = "Monitoring of biomass and biofuels contribution to atmospheric pollution by using nuclear techniques",
pages = "68-68",
doi = "10.21175/rad.abstr.book.2023.15.10"
}

Radenković, M., Topalović, D., Ćujić, M.,& Onjia, A.. (2023). Monitoring of biomass and biofuels contribution to atmospheric pollution by using nuclear techniques. in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts
Niš : RAD Centre., 68-68.
https://doi.org/10.21175/rad.abstr.book.2023.15.10

Radenković M, Topalović D, Ćujić M, Onjia A. Monitoring of biomass and biofuels contribution to atmospheric pollution by using nuclear techniques. in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts. 2023;:68-68.
doi:10.21175/rad.abstr.book.2023.15.10 .

Radenković, Mirjana, Topalović, Dušan, Ćujić, Mirjana, Onjia, Antonije, "Monitoring of biomass and biofuels contribution to atmospheric pollution by using nuclear techniques" in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts (2023):68-68,
https://doi.org/10.21175/rad.abstr.book.2023.15.10 . .

TY  - JOUR
AU  - Stanković Petrović, Jelena
AU  - Danilović, Nataša
AU  - Kržanović, Nikola
AU  - Topalović, Dušan
AU  - Živanović, Miloš
AU  - Božović, Predrag
AU  - Todorović, Nataša
AU  - Nikolov, Jovana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11642
AB  - Individual monitoring service at the Department for Radiation and Environmental Protection of Vinca Institute of
Nuclear Sciences performs individual whole-body and extremities monitoring of exposed workers, using thermoluminescent dosimetry (TLD) method. The dosemeters for eye-lens personal dose equivalent measurements,
Hp(3), are not regularly used at the workplaces in Serbia, even though the individual monitoring method is
accredited and available at the dosimetry service. Type testing of Hp(3) dosemeters based on LiF: Mg,Ti, placed in
modified ring holders was done following the changes in ISO 4037:2019 and IEC 62387:2020. The type testing
was done by varying radiation-based influence quantities: photon energies ranging from 33.3 keV up to 1.25
MeV, angle of incidence values of 0◦, 45◦, 60◦, 75◦, dose range from 0.05 mSv to 10 Sv. The results show that the
passive dosimetry monitoring system satisfies IEC 62387:2020 requirements in the mandatory range of influence
quantities, except for the lowest tested energy of 33 keV, when incident radiation angle is ±60◦ and higher.
T2  - Radiation Measurements
T1  - Type-testing of the TLD system used for the assessing the eye lens doses due to ionising radiation
VL  - 168
SP  - 107014
DO  - 10.1016/j.radmeas.2023.107014
ER  - 

@article{
author = "Stanković Petrović, Jelena and Danilović, Nataša and Kržanović, Nikola and Topalović, Dušan and Živanović, Miloš and Božović, Predrag and Todorović, Nataša and Nikolov, Jovana",
year = "2023",
abstract = "Individual monitoring service at the Department for Radiation and Environmental Protection of Vinca Institute of
Nuclear Sciences performs individual whole-body and extremities monitoring of exposed workers, using thermoluminescent dosimetry (TLD) method. The dosemeters for eye-lens personal dose equivalent measurements,
Hp(3), are not regularly used at the workplaces in Serbia, even though the individual monitoring method is
accredited and available at the dosimetry service. Type testing of Hp(3) dosemeters based on LiF: Mg,Ti, placed in
modified ring holders was done following the changes in ISO 4037:2019 and IEC 62387:2020. The type testing
was done by varying radiation-based influence quantities: photon energies ranging from 33.3 keV up to 1.25
MeV, angle of incidence values of 0◦, 45◦, 60◦, 75◦, dose range from 0.05 mSv to 10 Sv. The results show that the
passive dosimetry monitoring system satisfies IEC 62387:2020 requirements in the mandatory range of influence
quantities, except for the lowest tested energy of 33 keV, when incident radiation angle is ±60◦ and higher.",
journal = "Radiation Measurements",
title = "Type-testing of the TLD system used for the assessing the eye lens doses due to ionising radiation",
volume = "168",
pages = "107014",
doi = "10.1016/j.radmeas.2023.107014"
}

Stanković Petrović, J., Danilović, N., Kržanović, N., Topalović, D., Živanović, M., Božović, P., Todorović, N.,& Nikolov, J.. (2023). Type-testing of the TLD system used for the assessing the eye lens doses due to ionising radiation. in Radiation Measurements, 168, 107014.
https://doi.org/10.1016/j.radmeas.2023.107014

Stanković Petrović J, Danilović N, Kržanović N, Topalović D, Živanović M, Božović P, Todorović N, Nikolov J. Type-testing of the TLD system used for the assessing the eye lens doses due to ionising radiation. in Radiation Measurements. 2023;168:107014.
doi:10.1016/j.radmeas.2023.107014 .

Stanković Petrović, Jelena, Danilović, Nataša, Kržanović, Nikola, Topalović, Dušan, Živanović, Miloš, Božović, Predrag, Todorović, Nataša, Nikolov, Jovana, "Type-testing of the TLD system used for the assessing the eye lens doses due to ionising radiation" in Radiation Measurements, 168 (2023):107014,
https://doi.org/10.1016/j.radmeas.2023.107014 . .

TY  - CONF
AU  - Kržanović, Nikola
AU  - Stanković Petrović, Jelena
AU  - Živanović, Miloš
AU  - Krajinović, Marko
AU  - Topalović, Dušan
AU  - Kojić, Andrea
AU  - Božović, Predrag
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11908
AB  - Accuracy of measurement in individual dosimetry monitoring service is achieved by performing calibration of dosemeters, ensuring that the measured values are traceable to the primary standard for the quantity of interest. Even though a dosemeter can exhibit remarkable performance in the reference calibration radiation field (e.g. 137Cs), its performance can greatly differ under certain conditions. Effects of different influence quantities need to be examined to ensure that the dosemeters are reliable for use in a specific ionizing radiation practice. The most significant radiation characteristic influence quantities are the radiation energy, angle of incidence and dose (rate). International standards issued by IEC and ISO define radiation conditions and procedures for dosemeter type testing under effects of different radiation, environmental and mechanical influence quantities. Dosemeter performance is expressed in terms of relative response and is evaluated by comparing with defined limits of variation, taking into account the measurement uncertainty, according to [IEC 62387:2020, IEC, 2020]. A passive dosimetry system based on LiF:Mg,Ti thermoluminescent dosemeters (TLD) was tested for the effects of photon energy and angle of incidence in two dosemeter orientations, horizontal (up/down) and vertical (left/right), for the measurement of personal dose equivalent (Hp(10) and Hp(0.07)). The dosemeters were read out on the Harshaw TLD™ Model 6600 Plus Automated Reader (Thermo Fisher Scientific, USA), calibrated in 137Cs reference field. Low-energy X-ray reference field N-40, established according to ISO 4037-1:2019 [ISO 4037, ISO, 2019] and ±45°, ±60° angles of incidence were used to examine the passive dosimetry system performance. Limits of variation from -29 % to +67 %, defined in [IEC 62387:2020, IEC, 2020] for energy and angular relative response, were used for performance evaluation. The overresponses for Hp(10) for 45° and 60° were (51 – 62) % and (76 – 88) %, respectively. The results for Hp(0.07) for 45° and 60° were (66 – 69) % and (79 – 95) %, respectively. Thus, for both quantities it was observed that the criteria are met for the angle of ±45°, while for ±60° neither comply with the standard, for both dosemeter orientations, when uncertainties are taken into account. This shows that tested TLD system has high overresponse in low energy photon fields when larger angle of incidence values is encountered. The response could be improved if dosemeters are calibrated using appropriate reference calibration field or if different dosemeter holder is employed.
PB  - Niš : Sievert Association
C3  - RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts
T1  - LiF:Mg,Ti TLD angular dependence evaluation at low energy incident radiation
SP  - 60
EP  - 60
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11908
ER  - 

@conference{
author = "Kržanović, Nikola and Stanković Petrović, Jelena and Živanović, Miloš and Krajinović, Marko and Topalović, Dušan and Kojić, Andrea and Božović, Predrag",
year = "2023",
abstract = "Accuracy of measurement in individual dosimetry monitoring service is achieved by performing calibration of dosemeters, ensuring that the measured values are traceable to the primary standard for the quantity of interest. Even though a dosemeter can exhibit remarkable performance in the reference calibration radiation field (e.g. 137Cs), its performance can greatly differ under certain conditions. Effects of different influence quantities need to be examined to ensure that the dosemeters are reliable for use in a specific ionizing radiation practice. The most significant radiation characteristic influence quantities are the radiation energy, angle of incidence and dose (rate). International standards issued by IEC and ISO define radiation conditions and procedures for dosemeter type testing under effects of different radiation, environmental and mechanical influence quantities. Dosemeter performance is expressed in terms of relative response and is evaluated by comparing with defined limits of variation, taking into account the measurement uncertainty, according to [IEC 62387:2020, IEC, 2020]. A passive dosimetry system based on LiF:Mg,Ti thermoluminescent dosemeters (TLD) was tested for the effects of photon energy and angle of incidence in two dosemeter orientations, horizontal (up/down) and vertical (left/right), for the measurement of personal dose equivalent (Hp(10) and Hp(0.07)). The dosemeters were read out on the Harshaw TLD™ Model 6600 Plus Automated Reader (Thermo Fisher Scientific, USA), calibrated in 137Cs reference field. Low-energy X-ray reference field N-40, established according to ISO 4037-1:2019 [ISO 4037, ISO, 2019] and ±45°, ±60° angles of incidence were used to examine the passive dosimetry system performance. Limits of variation from -29 % to +67 %, defined in [IEC 62387:2020, IEC, 2020] for energy and angular relative response, were used for performance evaluation. The overresponses for Hp(10) for 45° and 60° were (51 – 62) % and (76 – 88) %, respectively. The results for Hp(0.07) for 45° and 60° were (66 – 69) % and (79 – 95) %, respectively. Thus, for both quantities it was observed that the criteria are met for the angle of ±45°, while for ±60° neither comply with the standard, for both dosemeter orientations, when uncertainties are taken into account. This shows that tested TLD system has high overresponse in low energy photon fields when larger angle of incidence values is encountered. The response could be improved if dosemeters are calibrated using appropriate reference calibration field or if different dosemeter holder is employed.",
publisher = "Niš : Sievert Association",
journal = "RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts",
title = "LiF:Mg,Ti TLD angular dependence evaluation at low energy incident radiation",
pages = "60-60",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11908"
}

Kržanović, N., Stanković Petrović, J., Živanović, M., Krajinović, M., Topalović, D., Kojić, A.,& Božović, P.. (2023). LiF:Mg,Ti TLD angular dependence evaluation at low energy incident radiation. in RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts
Niš : Sievert Association., 60-60.
https://hdl.handle.net/21.15107/rcub_vinar_11908

Kržanović N, Stanković Petrović J, Živanović M, Krajinović M, Topalović D, Kojić A, Božović P. LiF:Mg,Ti TLD angular dependence evaluation at low energy incident radiation. in RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts. 2023;:60-60.
https://hdl.handle.net/21.15107/rcub_vinar_11908 .

Kržanović, Nikola, Stanković Petrović, Jelena, Živanović, Miloš, Krajinović, Marko, Topalović, Dušan, Kojić, Andrea, Božović, Predrag, "LiF:Mg,Ti TLD angular dependence evaluation at low energy incident radiation" in RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts (2023):60-60,
https://hdl.handle.net/21.15107/rcub_vinar_11908 .

TY  - CONF
AU  - Topalović, Dušan
AU  - Krajinović, Marko
AU  - Vlahović, Jelena
AU  - Kržanović, Nikola
AU  - Božović, Predrag
AU  - Stanković Petrović, Jelena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11913
AB  - Thermoluminescent dosimetry is a widely used passive dosimetry method for estimating protection quantities i.e. the effective or equivalent dose. When the thermoluminescent dosemeters (TLD) are irradiated, they store the dose information through the processes of ionisation and subsequent trapping of charge carriers. The charge carriers in TLD crystalline material move from the ground state to the higher energy states (trapping centres) that are partially stable at room temperature. By heating the material, charge carriers leave the metastable energy states and recombine at recombination centres, emitting light (glow). The heating procedure gives rise to a glow curve (GC) – the light intensity as a function of temperature and time. By calibrating the TLD reader, the area under the GC is converted to a dose value (e.g., personal dose equivalent, Hp(10)). The shape of the GC depends on the time-temperature profile (TTP) defined for each TLD material separately and may be regular or possess some anomalies. Inspecting the GC shape, as one of quality control measures, is usually conducted qualitatively and performed by trained TLD service staff. Hence, this paper presents the implementation of the machine learning Time Series Forest (TSF) method for the classification of anomalous GCs of LiF:Mg,Ti based TLD. TSF is a tree – ensemble method that combines entropy gain and distance measure for evaluating splits. This method shows significant computational efficiency compared to the well – known one – nearest – neighbour classifier. The dataset used for the TSF method consists of 201 normalized GCs exported by the software supplied with Harshaw 6600 Plus Automated Reader – WinREMS. The dataset is labelled into five different classes: (1) regular shape, (2) spikes at random positions, (3) TLD signal in the low – temperature region, (4) TLD signal in the high – temperature region, and (5) shift of the entire GC to higher temperatures. A random split of the dataset into training and testing in a 70/30 training/test ratio was performed, while the 10 – fold cross – validation was used for the hyperparameter tuning. The results showed that the TSF method can classify four different anomalies for GC with an accuracy of 96% and a macro average F1 score of 96%. According to the obtained results, it is possible to conclude that the TSF is a promising candidate method that could be implemented as a new software package for automated GC quality control within the TLD service
PB  - Niš : Sievert Association
C3  - RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts
T1  - A Time Series Forest Method for automatic classification of anomalous glow curves of LiF:Mg,Ti based thermoluminescent dosemeters
SP  - 31
EP  - 31
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11913
ER  - 

@conference{
author = "Topalović, Dušan and Krajinović, Marko and Vlahović, Jelena and Kržanović, Nikola and Božović, Predrag and Stanković Petrović, Jelena",
year = "2023",
abstract = "Thermoluminescent dosimetry is a widely used passive dosimetry method for estimating protection quantities i.e. the effective or equivalent dose. When the thermoluminescent dosemeters (TLD) are irradiated, they store the dose information through the processes of ionisation and subsequent trapping of charge carriers. The charge carriers in TLD crystalline material move from the ground state to the higher energy states (trapping centres) that are partially stable at room temperature. By heating the material, charge carriers leave the metastable energy states and recombine at recombination centres, emitting light (glow). The heating procedure gives rise to a glow curve (GC) – the light intensity as a function of temperature and time. By calibrating the TLD reader, the area under the GC is converted to a dose value (e.g., personal dose equivalent, Hp(10)). The shape of the GC depends on the time-temperature profile (TTP) defined for each TLD material separately and may be regular or possess some anomalies. Inspecting the GC shape, as one of quality control measures, is usually conducted qualitatively and performed by trained TLD service staff. Hence, this paper presents the implementation of the machine learning Time Series Forest (TSF) method for the classification of anomalous GCs of LiF:Mg,Ti based TLD. TSF is a tree – ensemble method that combines entropy gain and distance measure for evaluating splits. This method shows significant computational efficiency compared to the well – known one – nearest – neighbour classifier. The dataset used for the TSF method consists of 201 normalized GCs exported by the software supplied with Harshaw 6600 Plus Automated Reader – WinREMS. The dataset is labelled into five different classes: (1) regular shape, (2) spikes at random positions, (3) TLD signal in the low – temperature region, (4) TLD signal in the high – temperature region, and (5) shift of the entire GC to higher temperatures. A random split of the dataset into training and testing in a 70/30 training/test ratio was performed, while the 10 – fold cross – validation was used for the hyperparameter tuning. The results showed that the TSF method can classify four different anomalies for GC with an accuracy of 96% and a macro average F1 score of 96%. According to the obtained results, it is possible to conclude that the TSF is a promising candidate method that could be implemented as a new software package for automated GC quality control within the TLD service",
publisher = "Niš : Sievert Association",
journal = "RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts",
title = "A Time Series Forest Method for automatic classification of anomalous glow curves of LiF:Mg,Ti based thermoluminescent dosemeters",
pages = "31-31",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11913"
}

Topalović, D., Krajinović, M., Vlahović, J., Kržanović, N., Božović, P.,& Stanković Petrović, J.. (2023). A Time Series Forest Method for automatic classification of anomalous glow curves of LiF:Mg,Ti based thermoluminescent dosemeters. in RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts
Niš : Sievert Association., 31-31.
https://hdl.handle.net/21.15107/rcub_vinar_11913

Topalović D, Krajinović M, Vlahović J, Kržanović N, Božović P, Stanković Petrović J. A Time Series Forest Method for automatic classification of anomalous glow curves of LiF:Mg,Ti based thermoluminescent dosemeters. in RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts. 2023;:31-31.
https://hdl.handle.net/21.15107/rcub_vinar_11913 .

Topalović, Dušan, Krajinović, Marko, Vlahović, Jelena, Kržanović, Nikola, Božović, Predrag, Stanković Petrović, Jelena, "A Time Series Forest Method for automatic classification of anomalous glow curves of LiF:Mg,Ti based thermoluminescent dosemeters" in RAP 2023 : International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; Book of abstracts (2023):31-31,
https://hdl.handle.net/21.15107/rcub_vinar_11913 .

TY  - CONF
AU  - Božović, Predrag
AU  - Kojić, Andrea
AU  - Kržanović, Nikola
AU  - Topalović, Dušan
AU  - Stanković Petrović, Jelena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11928
AB  - The aim of this work is to examine the accuracy of the delivered dose inside the blood irradiator using TL dosimeters. The TL dosimeters were placed behind the lead plate and were irradiated with absorbed dose values ranging from 50 mGy to 5 Gy in the 60Co reference radiation field. The deviations of the TL dosimeter readings in relation to the delivered values of the absorbed dose range from 7.8 % to 19.6 % with satisfactory linearity over the entire range of delivered doses (R=0.997). Monte Carlo simulations were used to determine the conversion coefficients for the application of this method in the 137Cs radiation field for devices that work with this type of radiation source.
AB  - Cilj ovog rada je ispitivanje tačnosti isporučene doze unutar ozračivača krvi koristeći TL dozimetre. TL dozimetri su postavljeni iza olovne ploče i ozračeni su vrednostima apsorbovane doze u opsegu od 50 mGy do 5 Gy u referentnom polju zračenja 60Co. Odstupanja očitavanja TL dozimetara u odnosu na isporučene vrednosti apsorbovane doze su u opsegu od 7.8% do 19.6% uz zadovoljavajuću linearnost na celom opsegu isporučenih doza (R=0.997). Monte Karlo simulacijama su određeni konverzioni koeficijenti za primenu ovog metoda i u polju zračenja 137Cs za uređaje koji rade sa ovom vrstom izvora zračenja.
PB  - Београд : Институт за нуклеарне науке "Винча" : Друштво за заштиту од зрачења Србије и Црне Горе
C3  - 32. simpozijum DZZSCG : zbornik radova
T1  - Application of TL Dosimeters for testing the accuracy of delivered dose in blood irradiator
T1  - Primena TL dozimetara za ispitivanje tačnosti isporučene doze u ozračivaču krvi
SP  - 387
EP  - 393
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11928
ER  - 

@conference{
author = "Božović, Predrag and Kojić, Andrea and Kržanović, Nikola and Topalović, Dušan and Stanković Petrović, Jelena",
year = "2023",
abstract = "The aim of this work is to examine the accuracy of the delivered dose inside the blood irradiator using TL dosimeters. The TL dosimeters were placed behind the lead plate and were irradiated with absorbed dose values ranging from 50 mGy to 5 Gy in the 60Co reference radiation field. The deviations of the TL dosimeter readings in relation to the delivered values of the absorbed dose range from 7.8 % to 19.6 % with satisfactory linearity over the entire range of delivered doses (R=0.997). Monte Carlo simulations were used to determine the conversion coefficients for the application of this method in the 137Cs radiation field for devices that work with this type of radiation source., Cilj ovog rada je ispitivanje tačnosti isporučene doze unutar ozračivača krvi koristeći TL dozimetre. TL dozimetri su postavljeni iza olovne ploče i ozračeni su vrednostima apsorbovane doze u opsegu od 50 mGy do 5 Gy u referentnom polju zračenja 60Co. Odstupanja očitavanja TL dozimetara u odnosu na isporučene vrednosti apsorbovane doze su u opsegu od 7.8% do 19.6% uz zadovoljavajuću linearnost na celom opsegu isporučenih doza (R=0.997). Monte Karlo simulacijama su određeni konverzioni koeficijenti za primenu ovog metoda i u polju zračenja 137Cs za uređaje koji rade sa ovom vrstom izvora zračenja.",
publisher = "Београд : Институт за нуклеарне науке "Винча" : Друштво за заштиту од зрачења Србије и Црне Горе",
journal = "32. simpozijum DZZSCG : zbornik radova",
title = "Application of TL Dosimeters for testing the accuracy of delivered dose in blood irradiator, Primena TL dozimetara za ispitivanje tačnosti isporučene doze u ozračivaču krvi",
pages = "387-393",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11928"
}

Božović, P., Kojić, A., Kržanović, N., Topalović, D.,& Stanković Petrović, J.. (2023). Application of TL Dosimeters for testing the accuracy of delivered dose in blood irradiator. in 32. simpozijum DZZSCG : zbornik radova
Београд : Институт за нуклеарне науке "Винча" : Друштво за заштиту од зрачења Србије и Црне Горе., 387-393.
https://hdl.handle.net/21.15107/rcub_vinar_11928

Božović P, Kojić A, Kržanović N, Topalović D, Stanković Petrović J. Application of TL Dosimeters for testing the accuracy of delivered dose in blood irradiator. in 32. simpozijum DZZSCG : zbornik radova. 2023;:387-393.
https://hdl.handle.net/21.15107/rcub_vinar_11928 .

Božović, Predrag, Kojić, Andrea, Kržanović, Nikola, Topalović, Dušan, Stanković Petrović, Jelena, "Application of TL Dosimeters for testing the accuracy of delivered dose in blood irradiator" in 32. simpozijum DZZSCG : zbornik radova (2023):387-393,
https://hdl.handle.net/21.15107/rcub_vinar_11928 .

TY  - JOUR
AU  - Kržanović, Nikola
AU  - Stanković-Petrović, Jelena S.
AU  - Živanović, Miloš
AU  - Krajinović, Marko
AU  - Božović, Predrag
AU  - Kojić, Andrea
AU  - Topalović, Dušan
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11433
AB  - A need for detailed testing of individual monitoring systems used in accredited service at the Vinca Institute of Nuclear Sciences was recognized following changes in individual, workplace, and environmental monitoring passive dosimetry systems acceptability criteria stated in IEC 62387:2020 and changes related to reference fields used in radiation protection defined in ISO 4037:2019. Reliability and accuracy of dosimetry data acquired by passive dosimetry systems used for individual monitoring is assured by carrying out type tests. In this manner, the effects of different radiation influence quantities are examined. Passive dosimetry systems comprised of an LiF:Mg,Ti (TLD-100) detector card placed in two different holder models (8814 and 8850) and the Harshaw TLD Model 6600 Plus Automated Reader were tested. Type tests were done in an extended range of photon energies from 40 keV up to 1.25 MeV, angle of incidence values of ±45° and ± 60° for both vertical and horizontal dosimeter orientation, and in the dose range from 0.05 mSv to 1 Sv. Both dosimetry system configurations perform in line with IEC 62387:2020 within mandatory range for tested influence quantities. Dosimeters that use the 8850 holder type showed less pronounced energy and angular dependence of the response in the low-energy range.
T2  - Health Physics
T1  - Characterization of Thermoluminescent Dosimetry Systems According to the IEC 62387:2020 Standard
VL  - 125
IS  - 3
SP  - 186
EP  - 197
DO  - 10.1097/HP.0000000000001711
ER  - 

@article{
author = "Kržanović, Nikola and Stanković-Petrović, Jelena S. and Živanović, Miloš and Krajinović, Marko and Božović, Predrag and Kojić, Andrea and Topalović, Dušan",
year = "2023",
abstract = "A need for detailed testing of individual monitoring systems used in accredited service at the Vinca Institute of Nuclear Sciences was recognized following changes in individual, workplace, and environmental monitoring passive dosimetry systems acceptability criteria stated in IEC 62387:2020 and changes related to reference fields used in radiation protection defined in ISO 4037:2019. Reliability and accuracy of dosimetry data acquired by passive dosimetry systems used for individual monitoring is assured by carrying out type tests. In this manner, the effects of different radiation influence quantities are examined. Passive dosimetry systems comprised of an LiF:Mg,Ti (TLD-100) detector card placed in two different holder models (8814 and 8850) and the Harshaw TLD Model 6600 Plus Automated Reader were tested. Type tests were done in an extended range of photon energies from 40 keV up to 1.25 MeV, angle of incidence values of ±45° and ± 60° for both vertical and horizontal dosimeter orientation, and in the dose range from 0.05 mSv to 1 Sv. Both dosimetry system configurations perform in line with IEC 62387:2020 within mandatory range for tested influence quantities. Dosimeters that use the 8850 holder type showed less pronounced energy and angular dependence of the response in the low-energy range.",
journal = "Health Physics",
title = "Characterization of Thermoluminescent Dosimetry Systems According to the IEC 62387:2020 Standard",
volume = "125",
number = "3",
pages = "186-197",
doi = "10.1097/HP.0000000000001711"
}

Kržanović, N., Stanković-Petrović, J. S., Živanović, M., Krajinović, M., Božović, P., Kojić, A.,& Topalović, D.. (2023). Characterization of Thermoluminescent Dosimetry Systems According to the IEC 62387:2020 Standard. in Health Physics, 125(3), 186-197.
https://doi.org/10.1097/HP.0000000000001711

Kržanović N, Stanković-Petrović JS, Živanović M, Krajinović M, Božović P, Kojić A, Topalović D. Characterization of Thermoluminescent Dosimetry Systems According to the IEC 62387:2020 Standard. in Health Physics. 2023;125(3):186-197.
doi:10.1097/HP.0000000000001711 .

Kržanović, Nikola, Stanković-Petrović, Jelena S., Živanović, Miloš, Krajinović, Marko, Božović, Predrag, Kojić, Andrea, Topalović, Dušan, "Characterization of Thermoluminescent Dosimetry Systems According to the IEC 62387:2020 Standard" in Health Physics, 125, no. 3 (2023):186-197,
https://doi.org/10.1097/HP.0000000000001711 . .

TY  - JOUR
AU  - Radenković, Mirjana
AU  - Topalović, Dušan
AU  - Radić, Ranka U.
AU  - Vukić, Ljiljana M.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10548
AB  - The sources of different pollutants contributing to ambient PM2.5 in the Banja Luka (Bosnia and Herzegovina) suburban area were estimated. From January 2016 to March 2017, a total of 140 daily PM2.5 filter samples were collected and analyzed by complementary nondestructive analytical techniques. Concentrations of Na, Mg, Al, Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, and Pb were determined by energy dispersive X-ray fluorescence technique while black carbon concentration was estimated using multi-wavelength absorption optical measurements. Evaluation of the emission sources was performed based on the obtained PM2.5 composition data using positive matrix factorization model. The results indicate five main groups of sources contributing to the annual mean PM2.5 concentration (38.7 µg/m3): secondary sulfur/coal combustion 35.4% (11.8 µg/m3), biomass combustion 26.1. % (9.2 µg/m3), road salts/heavy oil 21.2% (7.5 µg/m3), soil dust 1.1% (0.4 µg/m3) and traffic emissions less than 0.05%. Black carbon originating from diesel fuel and biomass burning was differentiated by applied optical technique and included into PMF analysis. The approach and results of the field study are unique and significant contribution to the air quality management in this area.Copyright © 2022 American Association for Aerosol Research
T2  - Aerosol Science and Technology
T1  - Assessment of PM2.5 sources in the Banja Luka (Bosnia and Herzegovina) suburban area using nondestructive techniques and positive matrix factorization
VL  - 57
IS  - 1
SP  - 77
EP  - 87
DO  - 10.1080/02786826.2022.2148515
ER  - 

@article{
author = "Radenković, Mirjana and Topalović, Dušan and Radić, Ranka U. and Vukić, Ljiljana M.",
year = "2023",
abstract = "The sources of different pollutants contributing to ambient PM2.5 in the Banja Luka (Bosnia and Herzegovina) suburban area were estimated. From January 2016 to March 2017, a total of 140 daily PM2.5 filter samples were collected and analyzed by complementary nondestructive analytical techniques. Concentrations of Na, Mg, Al, Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, and Pb were determined by energy dispersive X-ray fluorescence technique while black carbon concentration was estimated using multi-wavelength absorption optical measurements. Evaluation of the emission sources was performed based on the obtained PM2.5 composition data using positive matrix factorization model. The results indicate five main groups of sources contributing to the annual mean PM2.5 concentration (38.7 µg/m3): secondary sulfur/coal combustion 35.4% (11.8 µg/m3), biomass combustion 26.1. % (9.2 µg/m3), road salts/heavy oil 21.2% (7.5 µg/m3), soil dust 1.1% (0.4 µg/m3) and traffic emissions less than 0.05%. Black carbon originating from diesel fuel and biomass burning was differentiated by applied optical technique and included into PMF analysis. The approach and results of the field study are unique and significant contribution to the air quality management in this area.Copyright © 2022 American Association for Aerosol Research",
journal = "Aerosol Science and Technology",
title = "Assessment of PM2.5 sources in the Banja Luka (Bosnia and Herzegovina) suburban area using nondestructive techniques and positive matrix factorization",
volume = "57",
number = "1",
pages = "77-87",
doi = "10.1080/02786826.2022.2148515"
}

Radenković, M., Topalović, D., Radić, R. U.,& Vukić, L. M.. (2023). Assessment of PM2.5 sources in the Banja Luka (Bosnia and Herzegovina) suburban area using nondestructive techniques and positive matrix factorization. in Aerosol Science and Technology, 57(1), 77-87.
https://doi.org/10.1080/02786826.2022.2148515

Radenković M, Topalović D, Radić RU, Vukić LM. Assessment of PM2.5 sources in the Banja Luka (Bosnia and Herzegovina) suburban area using nondestructive techniques and positive matrix factorization. in Aerosol Science and Technology. 2023;57(1):77-87.
doi:10.1080/02786826.2022.2148515 .

Radenković, Mirjana, Topalović, Dušan, Radić, Ranka U., Vukić, Ljiljana M., "Assessment of PM2.5 sources in the Banja Luka (Bosnia and Herzegovina) suburban area using nondestructive techniques and positive matrix factorization" in Aerosol Science and Technology, 57, no. 1 (2023):77-87,
https://doi.org/10.1080/02786826.2022.2148515 . .

TY  - JOUR
AU  - Božilov, Aca
AU  - Tasić, Viša
AU  - Živković, Nenad
AU  - Lazović, Ivan
AU  - Blagojević, Milan
AU  - Mišić, Nikola
AU  - Topalović, Dušan
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10372
AB  - Over the last 10 years, as a possible alternative to the conventional approach to air quality monitoring, real-time monitoring systems that use low-cost sensors and sensor platforms have been frequently applied. Generally, the long-term characteristics of low-cost PM sensors and monitoring have not been thoroughly documented except for a few widely used sensors and monitors. This article addresses the laboratory and field validation of three low-cost PM monitors of the same type that use the NOVA SDS011 PM sensor module over a 1-year period. In outdoor environments, we co-located low-cost PM monitors with GRIMM EDM180 monitors at the National Air Quality Monitoring stations. In indoor environments, we co-located them with a Turnkey Osiris PM monitor. Several performance aspects of the PM monitors were examined: operational data coverage, linearity of response, accuracy, precision, and inter-sensor variability. The obtained results show that inter-monitor R values were typically higher than 0.95 regardless of the environment. The tested monitors demonstrate high linearity in comparison with PM10 and PM2.5 concentrations measured in outdoor air with reference-equivalent instrumentation with R2 values ranging from 0.52 up to 0.83. In addition, very good agreement (R2 values ranging from 0.93 up to 0.97) with the gravimetric PM10 and PM2.5 method is obtained in the indoor environment (30 < RH < 70%). High RH (over 70%) negatively affected the PM monitors’ response, especially in the case of PM10 concentrations (high overestimation).
T2  - Environmental Monitoring and Assessment
T1  - Performance assessment of NOVA SDS011 low-cost PM sensor in various microenvironments
VL  - 194
IS  - 9
SP  - 595
DO  - 10.1007/s10661-022-10290-7
ER  - 

@article{
author = "Božilov, Aca and Tasić, Viša and Živković, Nenad and Lazović, Ivan and Blagojević, Milan and Mišić, Nikola and Topalović, Dušan",
year = "2022",
abstract = "Over the last 10 years, as a possible alternative to the conventional approach to air quality monitoring, real-time monitoring systems that use low-cost sensors and sensor platforms have been frequently applied. Generally, the long-term characteristics of low-cost PM sensors and monitoring have not been thoroughly documented except for a few widely used sensors and monitors. This article addresses the laboratory and field validation of three low-cost PM monitors of the same type that use the NOVA SDS011 PM sensor module over a 1-year period. In outdoor environments, we co-located low-cost PM monitors with GRIMM EDM180 monitors at the National Air Quality Monitoring stations. In indoor environments, we co-located them with a Turnkey Osiris PM monitor. Several performance aspects of the PM monitors were examined: operational data coverage, linearity of response, accuracy, precision, and inter-sensor variability. The obtained results show that inter-monitor R values were typically higher than 0.95 regardless of the environment. The tested monitors demonstrate high linearity in comparison with PM10 and PM2.5 concentrations measured in outdoor air with reference-equivalent instrumentation with R2 values ranging from 0.52 up to 0.83. In addition, very good agreement (R2 values ranging from 0.93 up to 0.97) with the gravimetric PM10 and PM2.5 method is obtained in the indoor environment (30 < RH < 70%). High RH (over 70%) negatively affected the PM monitors’ response, especially in the case of PM10 concentrations (high overestimation).",
journal = "Environmental Monitoring and Assessment",
title = "Performance assessment of NOVA SDS011 low-cost PM sensor in various microenvironments",
volume = "194",
number = "9",
pages = "595",
doi = "10.1007/s10661-022-10290-7"
}

Božilov, A., Tasić, V., Živković, N., Lazović, I., Blagojević, M., Mišić, N.,& Topalović, D.. (2022). Performance assessment of NOVA SDS011 low-cost PM sensor in various microenvironments. in Environmental Monitoring and Assessment, 194(9), 595.
https://doi.org/10.1007/s10661-022-10290-7

Božilov A, Tasić V, Živković N, Lazović I, Blagojević M, Mišić N, Topalović D. Performance assessment of NOVA SDS011 low-cost PM sensor in various microenvironments. in Environmental Monitoring and Assessment. 2022;194(9):595.
doi:10.1007/s10661-022-10290-7 .

Božilov, Aca, Tasić, Viša, Živković, Nenad, Lazović, Ivan, Blagojević, Milan, Mišić, Nikola, Topalović, Dušan, "Performance assessment of NOVA SDS011 low-cost PM sensor in various microenvironments" in Environmental Monitoring and Assessment, 194, no. 9 (2022):595,
https://doi.org/10.1007/s10661-022-10290-7 . .

TY  - CONF
AU  - Radenković, Mirjana
AU  - Božić, Gavrilo
AU  - Krneta-Nikolić, Jelena D.
AU  - Topalović, Dušan
AU  - Radmanović, Svjetlana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11108
AB  - Mountain ecosystems are going through changes due to numerous physical-chemical processes in the environment rather than the anthropogenic activities. Primordial radioactivity of rock and soil material migrates and fractionates in other environmental sections like waters, air and biota. Having a feature to accumulate different minerals and trace element present in soil and three substrates, fungi indicates their composition and related processes. The aim of this study is uptake of radionuclides by fungi in the schist soil of the Stara Planina, mountain famous for biodiversity as well as for enhanced natural radioactivity areas. Samples of various fungi species (stipes and cups) and their soil substrates have been collected in summer season 2019. Collected soil samples are pedologically characterized and analysed by gamma-spectrometry (HP Ge) after the secular radioactive equilibrium had been reached. Soil characterization has shown the share of coarse fragments, sand, silt and clay in the schist (shale) structure while pH value was 4.80-5.33 and organic carbon content 3.10%. The content of significant natural radionuclides 40K, 226Ra, 232Th, 238U and manmade 137Cs was (in Bq/kg) was 500±30, 27±2, 26±2, 32±4, 1.6±0.2 respectively. Dried fungi samples were analysed by gamma spectrometry showing the natural radionuclide content in wide range of values. Obtained results indicate dependence of the radionuclides uptake from the substrate on their abundance in schist soil type as well as the fungus specie physiology. Slight difference was observed in results between content in species with different types of nutrient uptake (mycorrhizal and saprobic). The 137Cs content varied from 2-20 Bq/kg. Further knowledge on the local population habits in use of edible fungi species would enable dose assessment for the representatives of the public and contribute to a further research on the Stara Planina mountain ecosystem.
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro
T1  - Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem
SP  - 116
DO  - 10.21175/rad.sum.abstr.book.2022.27.7
ER  - 

@conference{
author = "Radenković, Mirjana and Božić, Gavrilo and Krneta-Nikolić, Jelena D. and Topalović, Dušan and Radmanović, Svjetlana",
year = "2022",
abstract = "Mountain ecosystems are going through changes due to numerous physical-chemical processes in the environment rather than the anthropogenic activities. Primordial radioactivity of rock and soil material migrates and fractionates in other environmental sections like waters, air and biota. Having a feature to accumulate different minerals and trace element present in soil and three substrates, fungi indicates their composition and related processes. The aim of this study is uptake of radionuclides by fungi in the schist soil of the Stara Planina, mountain famous for biodiversity as well as for enhanced natural radioactivity areas. Samples of various fungi species (stipes and cups) and their soil substrates have been collected in summer season 2019. Collected soil samples are pedologically characterized and analysed by gamma-spectrometry (HP Ge) after the secular radioactive equilibrium had been reached. Soil characterization has shown the share of coarse fragments, sand, silt and clay in the schist (shale) structure while pH value was 4.80-5.33 and organic carbon content 3.10%. The content of significant natural radionuclides 40K, 226Ra, 232Th, 238U and manmade 137Cs was (in Bq/kg) was 500±30, 27±2, 26±2, 32±4, 1.6±0.2 respectively. Dried fungi samples were analysed by gamma spectrometry showing the natural radionuclide content in wide range of values. Obtained results indicate dependence of the radionuclides uptake from the substrate on their abundance in schist soil type as well as the fungus specie physiology. Slight difference was observed in results between content in species with different types of nutrient uptake (mycorrhizal and saprobic). The 137Cs content varied from 2-20 Bq/kg. Further knowledge on the local population habits in use of edible fungi species would enable dose assessment for the representatives of the public and contribute to a further research on the Stara Planina mountain ecosystem.",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro",
title = "Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem",
pages = "116",
doi = "10.21175/rad.sum.abstr.book.2022.27.7"
}

Radenković, M., Božić, G., Krneta-Nikolić, J. D., Topalović, D.,& Radmanović, S.. (2022). Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 116.
https://doi.org/10.21175/rad.sum.abstr.book.2022.27.7

Radenković M, Božić G, Krneta-Nikolić JD, Topalović D, Radmanović S. Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro. 2022;:116.
doi:10.21175/rad.sum.abstr.book.2022.27.7 .

Radenković, Mirjana, Božić, Gavrilo, Krneta-Nikolić, Jelena D., Topalović, Dušan, Radmanović, Svjetlana, "Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem" in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro (2022):116,
https://doi.org/10.21175/rad.sum.abstr.book.2022.27.7 . .

TY  - CONF
AU  - Topalović, Dušan
AU  - Radenković, Mirjana
AU  - Stanković-Petrović, Jelena S.
AU  - Tasić, Viša
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11111
AB  - Light Absorbing Carbon (LAC) or Black carbon (BC) is one of the most important components of fine particulate matter (PM2.5), which is formed through the incomplete combustion of fossil fuels, biofuels and biomass. Based on a number of studies, it has been shown that carbonaceous particles significantly affect air quality/environment and they are an important factor in the carbon cycle and climate change. BC, as one of the constituents of carbonaceous respirable particles, has the property of absorbing light and leads to an increase in the annual average air temperature. Therefore, its quantitative analysis and differentiation for determination of potential radiative effects is extremely important. The BC concentration is usually determined by using thermal or optical methods. In this paper, the results of the application of multiwavelength optical technique for BC estimation which is based on measuring the intensity of absorption/transmission of light through samples of deposited aerosols on PTFE filters, are presented. Sample collection was conducted at Belgrade suburban background site, in heating and nonheating seasons, using low-volume air samplers. In order to estimate the BC concentration of different particle diameters, measurements were performed by using the MABI ANSTO instrument, with LEDs that emit light at seven different wavelengths: 405 nm, 465 nm, 525 nm, 639 nm, 870 nm, 940 nm and 1050nm. The measurement procedure is started by determination of the value of light transmission I0 through an unexposed or blank filter at different wavelengths. After sampling, the estimation of light transmission I through the exposed filters was performed. Before estimation of BC concentration, the light-absorbing coefficient (babs) at each wavelength was determined separately. More intense variations in the values of babs were observed, which most likely occur due to the change in the nature of the pollution sources at the sampling site. The accuracy of the BC concentration depends on the value of the mass absorption coefficient (ε) estimated experimentally and whose values are compared with the predefined manufacturer values. BC generated by combustion at lower temperatures is better absorbed at shorter wavelengths. On the other hand, BC generated through high-temperature processes is better absorbed in the infrared region of the electromagnetic spectrum. Therefore, the differences of BC concentrations at two boundary wavelengths: 405 nm and 1050 nm were analyzed. Finally, seasonal BC variations were observed, with increased values in the winter and autumn periods compared to the summer period.
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
T1  - Assessment and differentiation of light absorbing carbon in atmospheric aerosols
SP  - 51
DO  - 10.21175/rad.spr.abstr.book.2022.13.6
ER  - 

@conference{
author = "Topalović, Dušan and Radenković, Mirjana and Stanković-Petrović, Jelena S. and Tasić, Viša",
year = "2022",
abstract = "Light Absorbing Carbon (LAC) or Black carbon (BC) is one of the most important components of fine particulate matter (PM2.5), which is formed through the incomplete combustion of fossil fuels, biofuels and biomass. Based on a number of studies, it has been shown that carbonaceous particles significantly affect air quality/environment and they are an important factor in the carbon cycle and climate change. BC, as one of the constituents of carbonaceous respirable particles, has the property of absorbing light and leads to an increase in the annual average air temperature. Therefore, its quantitative analysis and differentiation for determination of potential radiative effects is extremely important. The BC concentration is usually determined by using thermal or optical methods. In this paper, the results of the application of multiwavelength optical technique for BC estimation which is based on measuring the intensity of absorption/transmission of light through samples of deposited aerosols on PTFE filters, are presented. Sample collection was conducted at Belgrade suburban background site, in heating and nonheating seasons, using low-volume air samplers. In order to estimate the BC concentration of different particle diameters, measurements were performed by using the MABI ANSTO instrument, with LEDs that emit light at seven different wavelengths: 405 nm, 465 nm, 525 nm, 639 nm, 870 nm, 940 nm and 1050nm. The measurement procedure is started by determination of the value of light transmission I0 through an unexposed or blank filter at different wavelengths. After sampling, the estimation of light transmission I through the exposed filters was performed. Before estimation of BC concentration, the light-absorbing coefficient (babs) at each wavelength was determined separately. More intense variations in the values of babs were observed, which most likely occur due to the change in the nature of the pollution sources at the sampling site. The accuracy of the BC concentration depends on the value of the mass absorption coefficient (ε) estimated experimentally and whose values are compared with the predefined manufacturer values. BC generated by combustion at lower temperatures is better absorbed at shorter wavelengths. On the other hand, BC generated through high-temperature processes is better absorbed in the infrared region of the electromagnetic spectrum. Therefore, the differences of BC concentrations at two boundary wavelengths: 405 nm and 1050 nm were analyzed. Finally, seasonal BC variations were observed, with increased values in the winter and autumn periods compared to the summer period.",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro",
title = "Assessment and differentiation of light absorbing carbon in atmospheric aerosols",
pages = "51",
doi = "10.21175/rad.spr.abstr.book.2022.13.6"
}

Topalović, D., Radenković, M., Stanković-Petrović, J. S.,& Tasić, V.. (2022). Assessment and differentiation of light absorbing carbon in atmospheric aerosols. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 51.
https://doi.org/10.21175/rad.spr.abstr.book.2022.13.6

Topalović D, Radenković M, Stanković-Petrović JS, Tasić V. Assessment and differentiation of light absorbing carbon in atmospheric aerosols. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro. 2022;:51.
doi:10.21175/rad.spr.abstr.book.2022.13.6 .

Topalović, Dušan, Radenković, Mirjana, Stanković-Petrović, Jelena S., Tasić, Viša, "Assessment and differentiation of light absorbing carbon in atmospheric aerosols" in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro (2022):51,
https://doi.org/10.21175/rad.spr.abstr.book.2022.13.6 . .

TY  - CONF
AU  - Stanković-Petrović, Jelena S.
AU  - Kržanović, Nikola
AU  - Živanović, Miloš
AU  - Topalović, Dušan
AU  - Kojić, Andrea
AU  - Božović, Predrag
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11118
AB  - The regular participation of an accredited individual monitoring service (IMS) in the international and/or interlaboratory intercomparisons (IC) is required according to ISO/IEC 17025:2017 standard, General requirements for the competence of testing and calibration laboratories. By taking the part in an IC, IMS shows competence, reliability, and has an opportunity to learn further and improve its measurement method. The European Dosimetry Group (EURADOS) Working Group 2 (WG2) has acknowledged the value of the regular IC and also found that data and results from it are fundamental for the harmonization of the measurement process [1]. Thus, EURADOS started a self-sustained program of IC for IMS for external radiation on a biannual basis. The results of an accredited IMS at the Department of Radiation and Environmental Protection, “VINČA” Institute of Nuclear Sciences, Belgrade, Serbia (IMS VINS) in the EURADOS IC for the period 2010-2020 (excluding 2014) are presented. IMS VINS use thermoluminescent whole body dosemeters based on two TLD-100TM (Thermo Scientific™ Harshaw™, USA) detectors. The readouts are done on the Harshaw TLD™ Model 6600 Plus Automated Reader (Thermo Fisher Scientific, USA). The whole glow curve is used for dose estimation (all of 200 channels). The calibration of the dosimetric system is done twice a year in S-Cs (previously in S-Co) field at the secondary standard dosimetry laboratory (SSDL VINS), according to ISO 4037-3:2019. The IC had 40 different reference values of personal dose equivalent, Hp(10) in noted period ranging from 0.431 mSv to 501 mSv. There were 20, 16, 22, 22, 20 dosemeters irradiated in year 2010, 2012, 2016, 2018, 2020, respectively. The radiations were done in 12 different fields: N-60, S-Co, S-Cs, N-40, N-150, S-Cs+Sr90, S-Cs+N-40, W-110, S-Cs+W-250, W-60, S-Cs+W-80, and S-Cs+N-150. The relative response (R) range is from 0.23 to 2.26. Quantile values for R are: 0.23, 0.79, 0.90, 1.1, and 2.26, respectively for (0%, 25 %, 50 %, 75 % and 100 % of points). Mean and standard deviation of R are 0.97 and 0.30, respectively. The performance limits are established according to ISO 14146 trumpet-curve [1]. Due to trumpet-curve there were 6 outliers (2 in 2010, 4 in 2016). All of the outliers were for reference dose around 1 mSv and lower. One outlier from 2010 was irradiated in N-40 field and 30° of incident angle. The other outlier was irradiated in the S-Cs field, without any rotation, and thus should have had a satisfying response. The possible explanation is an insensitive TL detector. The outliers in 2016 were all for N-40 quality and ±60° angle. Thus, considering the low number of outliers (only one true outlier) and expected dosemeters faulty response for given irradiation parameters, we conclude that the IMS VINS dosimetry system had satisfactory behavior during IC from 2010-2020.
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
T1  - Results of IMS participation in international intercomparisons for whole body dosemeters – 10 years of study
SP  - 129
DO  - 10.21175/rad.spr.abstr.book.2022.28.3
ER  - 

@conference{
author = "Stanković-Petrović, Jelena S. and Kržanović, Nikola and Živanović, Miloš and Topalović, Dušan and Kojić, Andrea and Božović, Predrag",
year = "2022",
abstract = "The regular participation of an accredited individual monitoring service (IMS) in the international and/or interlaboratory intercomparisons (IC) is required according to ISO/IEC 17025:2017 standard, General requirements for the competence of testing and calibration laboratories. By taking the part in an IC, IMS shows competence, reliability, and has an opportunity to learn further and improve its measurement method. The European Dosimetry Group (EURADOS) Working Group 2 (WG2) has acknowledged the value of the regular IC and also found that data and results from it are fundamental for the harmonization of the measurement process [1]. Thus, EURADOS started a self-sustained program of IC for IMS for external radiation on a biannual basis. The results of an accredited IMS at the Department of Radiation and Environmental Protection, “VINČA” Institute of Nuclear Sciences, Belgrade, Serbia (IMS VINS) in the EURADOS IC for the period 2010-2020 (excluding 2014) are presented. IMS VINS use thermoluminescent whole body dosemeters based on two TLD-100TM (Thermo Scientific™ Harshaw™, USA) detectors. The readouts are done on the Harshaw TLD™ Model 6600 Plus Automated Reader (Thermo Fisher Scientific, USA). The whole glow curve is used for dose estimation (all of 200 channels). The calibration of the dosimetric system is done twice a year in S-Cs (previously in S-Co) field at the secondary standard dosimetry laboratory (SSDL VINS), according to ISO 4037-3:2019. The IC had 40 different reference values of personal dose equivalent, Hp(10) in noted period ranging from 0.431 mSv to 501 mSv. There were 20, 16, 22, 22, 20 dosemeters irradiated in year 2010, 2012, 2016, 2018, 2020, respectively. The radiations were done in 12 different fields: N-60, S-Co, S-Cs, N-40, N-150, S-Cs+Sr90, S-Cs+N-40, W-110, S-Cs+W-250, W-60, S-Cs+W-80, and S-Cs+N-150. The relative response (R) range is from 0.23 to 2.26. Quantile values for R are: 0.23, 0.79, 0.90, 1.1, and 2.26, respectively for (0%, 25 %, 50 %, 75 % and 100 % of points). Mean and standard deviation of R are 0.97 and 0.30, respectively. The performance limits are established according to ISO 14146 trumpet-curve [1]. Due to trumpet-curve there were 6 outliers (2 in 2010, 4 in 2016). All of the outliers were for reference dose around 1 mSv and lower. One outlier from 2010 was irradiated in N-40 field and 30° of incident angle. The other outlier was irradiated in the S-Cs field, without any rotation, and thus should have had a satisfying response. The possible explanation is an insensitive TL detector. The outliers in 2016 were all for N-40 quality and ±60° angle. Thus, considering the low number of outliers (only one true outlier) and expected dosemeters faulty response for given irradiation parameters, we conclude that the IMS VINS dosimetry system had satisfactory behavior during IC from 2010-2020.",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro",
title = "Results of IMS participation in international intercomparisons for whole body dosemeters – 10 years of study",
pages = "129",
doi = "10.21175/rad.spr.abstr.book.2022.28.3"
}

Stanković-Petrović, J. S., Kržanović, N., Živanović, M., Topalović, D., Kojić, A.,& Božović, P.. (2022). Results of IMS participation in international intercomparisons for whole body dosemeters – 10 years of study. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 129.
https://doi.org/10.21175/rad.spr.abstr.book.2022.28.3

Stanković-Petrović JS, Kržanović N, Živanović M, Topalović D, Kojić A, Božović P. Results of IMS participation in international intercomparisons for whole body dosemeters – 10 years of study. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro. 2022;:129.
doi:10.21175/rad.spr.abstr.book.2022.28.3 .

Stanković-Petrović, Jelena S., Kržanović, Nikola, Živanović, Miloš, Topalović, Dušan, Kojić, Andrea, Božović, Predrag, "Results of IMS participation in international intercomparisons for whole body dosemeters – 10 years of study" in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro (2022):129,
https://doi.org/10.21175/rad.spr.abstr.book.2022.28.3 . .

TY  - CONF
AU  - Tasić, V.
AU  - Božilov, A.
AU  - Lazović, Ivan
AU  - Mirkov, Nikola S.
AU  - Topalović, Dušan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10993
PB  - Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences
C3  - WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia
T1  - Civic Air Quality Monitoring As an Alternative and Supplement to the State Air Quality Monitoring Network
SP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10993
ER  - 

@conference{
author = "Tasić, V. and Božilov, A. and Lazović, Ivan and Mirkov, Nikola S. and Topalović, Dušan",
year = "2021",
publisher = "Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences",
journal = "WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia",
title = "Civic Air Quality Monitoring As an Alternative and Supplement to the State Air Quality Monitoring Network",
pages = "70",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10993"
}

Tasić, V., Božilov, A., Lazović, I., Mirkov, N. S.,& Topalović, D.. (2021). Civic Air Quality Monitoring As an Alternative and Supplement to the State Air Quality Monitoring Network. in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia
Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences., 70.
https://hdl.handle.net/21.15107/rcub_vinar_10993

Tasić V, Božilov A, Lazović I, Mirkov NS, Topalović D. Civic Air Quality Monitoring As an Alternative and Supplement to the State Air Quality Monitoring Network. in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia. 2021;:70.
https://hdl.handle.net/21.15107/rcub_vinar_10993 .

Tasić, V., Božilov, A., Lazović, Ivan, Mirkov, Nikola S., Topalović, Dušan, "Civic Air Quality Monitoring As an Alternative and Supplement to the State Air Quality Monitoring Network" in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia (2021):70,
https://hdl.handle.net/21.15107/rcub_vinar_10993 .

TY  - CONF
AU  - Tasić, V.
AU  - Božilov, A.
AU  - Mišić, N.
AU  - Lazović, Ivan
AU  - Mirkov, Nikola S.
AU  - Topalović, Dušan
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10996
PB  - Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences
C3  - WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia
T1  - Portable Air Quality Monitor Based on Low-Cost Sensors
SP  - 75
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10996
ER  - 

@conference{
author = "Tasić, V. and Božilov, A. and Mišić, N. and Lazović, Ivan and Mirkov, Nikola S. and Topalović, Dušan",
year = "2021",
publisher = "Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences",
journal = "WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia",
title = "Portable Air Quality Monitor Based on Low-Cost Sensors",
pages = "75",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10996"
}

Tasić, V., Božilov, A., Mišić, N., Lazović, I., Mirkov, N. S.,& Topalović, D.. (2021). Portable Air Quality Monitor Based on Low-Cost Sensors. in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia
Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences., 75.
https://hdl.handle.net/21.15107/rcub_vinar_10996

Tasić V, Božilov A, Mišić N, Lazović I, Mirkov NS, Topalović D. Portable Air Quality Monitor Based on Low-Cost Sensors. in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia. 2021;:75.
https://hdl.handle.net/21.15107/rcub_vinar_10996 .

Tasić, V., Božilov, A., Mišić, N., Lazović, Ivan, Mirkov, Nikola S., Topalović, Dušan, "Portable Air Quality Monitor Based on Low-Cost Sensors" in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia (2021):75,
https://hdl.handle.net/21.15107/rcub_vinar_10996 .

TY  - CONF
AU  - Radenković, Mirjana
AU  - Topalović, Dušan
AU  - Trtić-Petrović, Tatjana M.
AU  - Tasić, Viša
AU  - Stanković, Srboljub
AU  - Stanić, Vojislav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11123
AB  - Besides the evident harmful impact to human health, black carbon (BC) is considered as second important contributor to climate change due to its sunlight absorption and warming effects. It is a major component of fine atmospheric particulate matter emitted during the incomplete combustion of fossil fuels and biomass burning emissions from both natural and anthropogenic sources. Atmospheric carbon was recognized in forms of soot, black carbon, elemental carbon, inorganic carbon, organic carbon, brown carbon, etc, depending on the origin and absorption characteristics. Measurement methodologies for BC analysis in aerosol samples are mostly based on optical and thermal properties of carbon species. Here are presented results of the application of the optical analytical technique which relies on the multi-wavelenght light attenuation by black carbon component of fine particulate matter deposited on filter media. For that purpose, standard polytetrafluoroethylene (PTFE), quartz and carbon nanotube filters with different qualitative features and pore diameters were exposed to fine aerosol fraction at urban background monitoring site in heating and non heating seasons, using low-volume air samplers with 2.3 m3/h air flow. A multi wavelength absorption black carbon instrument (MABI) with 405 nm, 465 nm, 525 nm, 639 nm, 870 nm, 940 nm and 1050 nm LEDs was used for blank and exposed filters analysis and black carbon evaluation. Differences in obtained BC values are discussed in relation to various absorption potential of different filter media, taking into account absorption coefficients dependence on the wavelength and density. Main advantage of this method is simplicity and complementarity with nondestructive nuclear analytical techniques (EDXRF, PIXE) for elemental analysis of fine aerosol fraction on specific filter media. Differentiation between black carbon coming from fossil fuels combustion and from biomass burning sources would be additional information valuable for source apportionment analysis using positive matrix factorization and reliable discussion of air pollution observed at selected receptor site.
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro
T1  - Evaluation of black carbon in fine atmospheric particulate matter on various filter types by multi-wavelength light absorption technique
SP  - 64
DO  - 10.21175/rad.abstr.book.2021.11.6
ER  - 

@conference{
author = "Radenković, Mirjana and Topalović, Dušan and Trtić-Petrović, Tatjana M. and Tasić, Viša and Stanković, Srboljub and Stanić, Vojislav",
year = "2021",
abstract = "Besides the evident harmful impact to human health, black carbon (BC) is considered as second important contributor to climate change due to its sunlight absorption and warming effects. It is a major component of fine atmospheric particulate matter emitted during the incomplete combustion of fossil fuels and biomass burning emissions from both natural and anthropogenic sources. Atmospheric carbon was recognized in forms of soot, black carbon, elemental carbon, inorganic carbon, organic carbon, brown carbon, etc, depending on the origin and absorption characteristics. Measurement methodologies for BC analysis in aerosol samples are mostly based on optical and thermal properties of carbon species. Here are presented results of the application of the optical analytical technique which relies on the multi-wavelenght light attenuation by black carbon component of fine particulate matter deposited on filter media. For that purpose, standard polytetrafluoroethylene (PTFE), quartz and carbon nanotube filters with different qualitative features and pore diameters were exposed to fine aerosol fraction at urban background monitoring site in heating and non heating seasons, using low-volume air samplers with 2.3 m3/h air flow. A multi wavelength absorption black carbon instrument (MABI) with 405 nm, 465 nm, 525 nm, 639 nm, 870 nm, 940 nm and 1050 nm LEDs was used for blank and exposed filters analysis and black carbon evaluation. Differences in obtained BC values are discussed in relation to various absorption potential of different filter media, taking into account absorption coefficients dependence on the wavelength and density. Main advantage of this method is simplicity and complementarity with nondestructive nuclear analytical techniques (EDXRF, PIXE) for elemental analysis of fine aerosol fraction on specific filter media. Differentiation between black carbon coming from fossil fuels combustion and from biomass burning sources would be additional information valuable for source apportionment analysis using positive matrix factorization and reliable discussion of air pollution observed at selected receptor site.",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro",
title = "Evaluation of black carbon in fine atmospheric particulate matter on various filter types by multi-wavelength light absorption technique",
pages = "64",
doi = "10.21175/rad.abstr.book.2021.11.6"
}

Radenković, M., Topalović, D., Trtić-Petrović, T. M., Tasić, V., Stanković, S.,& Stanić, V.. (2021). Evaluation of black carbon in fine atmospheric particulate matter on various filter types by multi-wavelength light absorption technique. in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 64.
https://doi.org/10.21175/rad.abstr.book.2021.11.6

Radenković M, Topalović D, Trtić-Petrović TM, Tasić V, Stanković S, Stanić V. Evaluation of black carbon in fine atmospheric particulate matter on various filter types by multi-wavelength light absorption technique. in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro. 2021;:64.
doi:10.21175/rad.abstr.book.2021.11.6 .

Radenković, Mirjana, Topalović, Dušan, Trtić-Petrović, Tatjana M., Tasić, Viša, Stanković, Srboljub, Stanić, Vojislav, "Evaluation of black carbon in fine atmospheric particulate matter on various filter types by multi-wavelength light absorption technique" in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro (2021):64,
https://doi.org/10.21175/rad.abstr.book.2021.11.6 . .

TY  - CONF
AU  - Topalović, Dušan
AU  - Radenković, Mirjana
AU  - Tasić, Viša
AU  - Stanić, Vojislav
AU  - Božović, Predrag
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11124
AB  - Positive matrix factorization (PMF) is a dimension reduction method used to model the covariance structures of observable variables in order to impel a smaller number of latent nonnegative factors. It resolves receptor modeling problem, which is based on the chemical mass balance equation (CMB) and may discover hidden patterns in the environmental data, where each extracted factor is accompanied by an actual source of emission. In this paper, PMF source apportionment analyses of fine aerosol fraction (PM2.5 mode) at Belgrade suburban background site, in 2016/17 year, have been performed by processing a data set of 130 PM2.5 mass concentrations and twenty-one elemental concentrations and soot concentrations in each PM2.5 sample (mode). The PM2.5 mass concentrations in collected samples have been determined following SRPS EN 12341:201 procedure, elemental concentrations were obtained by PIXE alanytical technique in the frame of the regional IAEA project, in the Institute of Nuclear Research, Hungarian Academy of Sciences, and soot concentrations were analyzed by smoke stain reflectometry in accordance with ISO 9835:1993 (E). The EPA PMF program ver 5.0, was used to solve the PMF model. Since the determination of an optimal PMF solution is a strongly heuristic procedure, there is a necessity of finding a more quantitative ways to reduce the arbitrariness of this technique. In order to reduce the range of possible solutions, we have analyzed how the values of model parameters changes as a function of the number of factors. PMF modeling was performed in a robust mode. For the purpose of finding the best fit solution wich minimize the object function Q, we varied the number of factors in the range from 4 to 8. Additionally, influence of rotations are also analyzed in iterative steps by varying FPEAK function in the range -1 to +1 with an increment of 0.5. Obtained results indicated significant role of Q/Qexp ratio analysis for optimal solution choice. In optimization process, number of factors with Q/Qexp ratio less than 1, were rejected as a possible solutions. This paper shows that optimization procedure should include examination of rotational matrix in which the rotational degree of freedom of solution is considered. Solutions with a steep change in their rotational degree of freedom were rejected. Finally, the additional improvement can be done by optimizing the parameters representing the scaled mean value (IM) and the scaled standard deviation (IS) of the each individual column in scaled residual matrix.
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro
T1  - Optimization of the source apportionment solution using the rotational tools in US EPA PMF 5.0 software
SP  - 68
DO  - 10.21175/rad.abstr.book.2021.12.3
ER  - 

@conference{
author = "Topalović, Dušan and Radenković, Mirjana and Tasić, Viša and Stanić, Vojislav and Božović, Predrag",
year = "2021",
abstract = "Positive matrix factorization (PMF) is a dimension reduction method used to model the covariance structures of observable variables in order to impel a smaller number of latent nonnegative factors. It resolves receptor modeling problem, which is based on the chemical mass balance equation (CMB) and may discover hidden patterns in the environmental data, where each extracted factor is accompanied by an actual source of emission. In this paper, PMF source apportionment analyses of fine aerosol fraction (PM2.5 mode) at Belgrade suburban background site, in 2016/17 year, have been performed by processing a data set of 130 PM2.5 mass concentrations and twenty-one elemental concentrations and soot concentrations in each PM2.5 sample (mode). The PM2.5 mass concentrations in collected samples have been determined following SRPS EN 12341:201 procedure, elemental concentrations were obtained by PIXE alanytical technique in the frame of the regional IAEA project, in the Institute of Nuclear Research, Hungarian Academy of Sciences, and soot concentrations were analyzed by smoke stain reflectometry in accordance with ISO 9835:1993 (E). The EPA PMF program ver 5.0, was used to solve the PMF model. Since the determination of an optimal PMF solution is a strongly heuristic procedure, there is a necessity of finding a more quantitative ways to reduce the arbitrariness of this technique. In order to reduce the range of possible solutions, we have analyzed how the values of model parameters changes as a function of the number of factors. PMF modeling was performed in a robust mode. For the purpose of finding the best fit solution wich minimize the object function Q, we varied the number of factors in the range from 4 to 8. Additionally, influence of rotations are also analyzed in iterative steps by varying FPEAK function in the range -1 to +1 with an increment of 0.5. Obtained results indicated significant role of Q/Qexp ratio analysis for optimal solution choice. In optimization process, number of factors with Q/Qexp ratio less than 1, were rejected as a possible solutions. This paper shows that optimization procedure should include examination of rotational matrix in which the rotational degree of freedom of solution is considered. Solutions with a steep change in their rotational degree of freedom were rejected. Finally, the additional improvement can be done by optimizing the parameters representing the scaled mean value (IM) and the scaled standard deviation (IS) of the each individual column in scaled residual matrix.",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro",
title = "Optimization of the source apportionment solution using the rotational tools in US EPA PMF 5.0 software",
pages = "68",
doi = "10.21175/rad.abstr.book.2021.12.3"
}

Topalović, D., Radenković, M., Tasić, V., Stanić, V.,& Božović, P.. (2021). Optimization of the source apportionment solution using the rotational tools in US EPA PMF 5.0 software. in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 68.
https://doi.org/10.21175/rad.abstr.book.2021.12.3

Topalović D, Radenković M, Tasić V, Stanić V, Božović P. Optimization of the source apportionment solution using the rotational tools in US EPA PMF 5.0 software. in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro. 2021;:68.
doi:10.21175/rad.abstr.book.2021.12.3 .

Topalović, Dušan, Radenković, Mirjana, Tasić, Viša, Stanić, Vojislav, Božović, Predrag, "Optimization of the source apportionment solution using the rotational tools in US EPA PMF 5.0 software" in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro (2021):68,
https://doi.org/10.21175/rad.abstr.book.2021.12.3 . .

TY  - CONF
AU  - Radenković, Mirjana
AU  - Rafajlović, Stefan
AU  - Topalović, Dušan
AU  - Joksić, Jasminka
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10126
AB  - U radu je dat prikaz nacionalne regulative, međunarodnih preporuka i obavezujućih dokumenta u oblasti radijacione i nuklearne bezbednosti. Navedene su odabrane publikacije MAAE sa standardima i preporukama na kojima se zasniva i evropska regulativa u ovoj oblasti, kao vodič pri razvoju ili reviziji nacionalne regulative. Poseban akcenat je stavljen na mogućnosti saradnje pri izgradnji i unapređivanju nacionalnog režima nuklearne bezbednosti ili pojedinih njegovih komponenti. Istaknuta je uloga savetodavnih misija kao što je IPPAS, koje nakon odgovarajućih procena i preporuka, na zahtev mogu predložiti i dugoročni program tehničke pomoći, kao i INSSP koji omogućava omogućava jačanje i održivost sistema nuklearne bezbednosti kroz dugoročnu planiranu saradnju.
AB  - National regulations, international recommendations and obligations in radiation and nuclear security are presented in the paper. Selected IAEA publications are listed with given standards and recommendations on which the European regulations in nuclear security are based, as a guidance for development or revision of national regulations. Special accent was put on the possibilities of technical cooperation in establishing and enhancement of the national nuclear security regime or its components. The role of the IAEA IPPAS advisory mission was emphasized as the follow-up of the assessment and recommendations, based on the state’s request, may be a long-term technical cooperation program as well as the INSSP role, enabling strengthening and sustainability of the nuclear security system in the frame of the long-term partnerships and cooperation.
PB  - Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - 31. симпозијум ДЗЗСЦГ : зборник радова
T1  - Regulativa, preporuke i mogućnosti saradnje u oblasti radijacione i nuklearne bezbednosti
T1  - Nuclear Security: Regulations, Reccomendations and Forms of Cooperation
SP  - 315
EP  - 320
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10126
ER  - 

@conference{
author = "Radenković, Mirjana and Rafajlović, Stefan and Topalović, Dušan and Joksić, Jasminka",
year = "2021",
abstract = "U radu je dat prikaz nacionalne regulative, međunarodnih preporuka i obavezujućih dokumenta u oblasti radijacione i nuklearne bezbednosti. Navedene su odabrane publikacije MAAE sa standardima i preporukama na kojima se zasniva i evropska regulativa u ovoj oblasti, kao vodič pri razvoju ili reviziji nacionalne regulative. Poseban akcenat je stavljen na mogućnosti saradnje pri izgradnji i unapređivanju nacionalnog režima nuklearne bezbednosti ili pojedinih njegovih komponenti. Istaknuta je uloga savetodavnih misija kao što je IPPAS, koje nakon odgovarajućih procena i preporuka, na zahtev mogu predložiti i dugoročni program tehničke pomoći, kao i INSSP koji omogućava omogućava jačanje i održivost sistema nuklearne bezbednosti kroz dugoročnu planiranu saradnju., National regulations, international recommendations and obligations in radiation and nuclear security are presented in the paper. Selected IAEA publications are listed with given standards and recommendations on which the European regulations in nuclear security are based, as a guidance for development or revision of national regulations. Special accent was put on the possibilities of technical cooperation in establishing and enhancement of the national nuclear security regime or its components. The role of the IAEA IPPAS advisory mission was emphasized as the follow-up of the assessment and recommendations, based on the state’s request, may be a long-term technical cooperation program as well as the INSSP role, enabling strengthening and sustainability of the nuclear security system in the frame of the long-term partnerships and cooperation.",
publisher = "Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "31. симпозијум ДЗЗСЦГ : зборник радова",
title = "Regulativa, preporuke i mogućnosti saradnje u oblasti radijacione i nuklearne bezbednosti, Nuclear Security: Regulations, Reccomendations and Forms of Cooperation",
pages = "315-320",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10126"
}

Radenković, M., Rafajlović, S., Topalović, D.,& Joksić, J.. (2021). Regulativa, preporuke i mogućnosti saradnje u oblasti radijacione i nuklearne bezbednosti. in 31. симпозијум ДЗЗСЦГ : зборник радова
Institut za nuklearne nauke "Vinča"., 315-320.
https://hdl.handle.net/21.15107/rcub_vinar_10126

Radenković M, Rafajlović S, Topalović D, Joksić J. Regulativa, preporuke i mogućnosti saradnje u oblasti radijacione i nuklearne bezbednosti. in 31. симпозијум ДЗЗСЦГ : зборник радова. 2021;:315-320.
https://hdl.handle.net/21.15107/rcub_vinar_10126 .

Radenković, Mirjana, Rafajlović, Stefan, Topalović, Dušan, Joksić, Jasminka, "Regulativa, preporuke i mogućnosti saradnje u oblasti radijacione i nuklearne bezbednosti" in 31. симпозијум ДЗЗСЦГ : зборник радова (2021):315-320,
https://hdl.handle.net/21.15107/rcub_vinar_10126 .

TY  - CONF
AU  - Topalović, Dušan
AU  - Arsoski, V. V.
AU  - Tadić, M. Ž.
AU  - Radenković, M.
AU  - Božović, Predrag
AU  - Peeters, F. M.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10903
AB  - HgTe is a II-VI compound semi-metal with inverted band ordering, low effective mass and high electron mobility [1]. Nanostructures based on this compound are intensively studied due to their specific topological properties [2]. In HgTe based nanostructures an inversion in the band ordering is accompanied by a quantum phase transition from a normal insulator to the phase of a nontrivial twodimensional (2D) topological insulator or the Quantum Spin Hall insulator [3]. A good dynamic stability of HgTe monolayer is predicted from first-principles methods [4], which opened the possibility to use this material in thin-layer electronic devices. Even before these theoretical findings, HgTe nanoribbons have been experimentally realized [5], and a topological field effect quantum transistor was proposed [6]. We investigate the electronic and transport properties of low-buckled 2D HgTe zig-zag and armchair nanoribbons. Modeling of electronic states was performed by using a single-particle tight-binding model in the nearest-neighbour approximation [7]. The sp3d 5 s * basis set in the Slater-Koster notation was used. The spin-orbit interaction was included in the model by using the Chadi formalism [8]. We found specific edge states in the range of energies that define the fundamental band gap of 2D HgTe monolayer. Moreover, we show that the electronic and transport properties of these states depend strongly on nanoribbon width and type of edge, and we demonstrate how external fields can be employed to control them.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Influence of boundary conditions on electronic and transport properties in monolayer low – buckled HgTe nanoribbons
SP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10903
ER  - 

@conference{
author = "Topalović, Dušan and Arsoski, V. V. and Tadić, M. Ž. and Radenković, M. and Božović, Predrag and Peeters, F. M.",
year = "2021",
abstract = "HgTe is a II-VI compound semi-metal with inverted band ordering, low effective mass and high electron mobility [1]. Nanostructures based on this compound are intensively studied due to their specific topological properties [2]. In HgTe based nanostructures an inversion in the band ordering is accompanied by a quantum phase transition from a normal insulator to the phase of a nontrivial twodimensional (2D) topological insulator or the Quantum Spin Hall insulator [3]. A good dynamic stability of HgTe monolayer is predicted from first-principles methods [4], which opened the possibility to use this material in thin-layer electronic devices. Even before these theoretical findings, HgTe nanoribbons have been experimentally realized [5], and a topological field effect quantum transistor was proposed [6]. We investigate the electronic and transport properties of low-buckled 2D HgTe zig-zag and armchair nanoribbons. Modeling of electronic states was performed by using a single-particle tight-binding model in the nearest-neighbour approximation [7]. The sp3d 5 s * basis set in the Slater-Koster notation was used. The spin-orbit interaction was included in the model by using the Chadi formalism [8]. We found specific edge states in the range of energies that define the fundamental band gap of 2D HgTe monolayer. Moreover, we show that the electronic and transport properties of these states depend strongly on nanoribbon width and type of edge, and we demonstrate how external fields can be employed to control them.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Influence of boundary conditions on electronic and transport properties in monolayer low – buckled HgTe nanoribbons",
pages = "77",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10903"
}

Topalović, D., Arsoski, V. V., Tadić, M. Ž., Radenković, M., Božović, P.,& Peeters, F. M.. (2021). Influence of boundary conditions on electronic and transport properties in monolayer low – buckled HgTe nanoribbons. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 77.
https://hdl.handle.net/21.15107/rcub_vinar_10903

Topalović D, Arsoski VV, Tadić MŽ, Radenković M, Božović P, Peeters FM. Influence of boundary conditions on electronic and transport properties in monolayer low – buckled HgTe nanoribbons. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:77.
https://hdl.handle.net/21.15107/rcub_vinar_10903 .

Topalović, Dušan, Arsoski, V. V., Tadić, M. Ž., Radenković, M., Božović, Predrag, Peeters, F. M., "Influence of boundary conditions on electronic and transport properties in monolayer low – buckled HgTe nanoribbons" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):77,
https://hdl.handle.net/21.15107/rcub_vinar_10903 .

TY  - CONF
AU  - Davidović, Miloš
AU  - Topalović, Dušan
AU  - Stanković, Srboljub
AU  - Živanović, Miloš
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11137
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference
T1  - On the determination of uncertainty budget of electromagnetic field spectrum analyzers – A case study
SP  - 80
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11137
ER  - 

@conference{
author = "Davidović, Miloš and Topalović, Dušan and Stanković, Srboljub and Živanović, Miloš",
year = "2020",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference",
title = "On the determination of uncertainty budget of electromagnetic field spectrum analyzers – A case study",
pages = "80",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11137"
}

Davidović, M., Topalović, D., Stanković, S.,& Živanović, M.. (2020). On the determination of uncertainty budget of electromagnetic field spectrum analyzers – A case study. in RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference
RAD Centre, Niš, Serbia., 80.
https://hdl.handle.net/21.15107/rcub_vinar_11137

Davidović M, Topalović D, Stanković S, Živanović M. On the determination of uncertainty budget of electromagnetic field spectrum analyzers – A case study. in RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference. 2020;:80.
https://hdl.handle.net/21.15107/rcub_vinar_11137 .

Davidović, Miloš, Topalović, Dušan, Stanković, Srboljub, Živanović, Miloš, "On the determination of uncertainty budget of electromagnetic field spectrum analyzers – A case study" in RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference (2020):80,
https://hdl.handle.net/21.15107/rcub_vinar_11137 .

TY  - JOUR
AU  - Topalović, Dušan
AU  - Arsoski, Vladimir V.
AU  - Tadić, Milan Ž.
AU  - Peeters, Francois M.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9616
AB  - We investigate the electron states in double asymmetric HgTe / Cd x Hg 1 - x Te quantum wells grown along the [001] direction. The subbands are computed by means of the envelope function approximation applied to the eight-band Kane k ⋅ p model. The asymmetry of the confining potential of the double quantum wells results in a gap opening, which is absent in the symmetric system where it can only be induced by an applied electric field. The bandgap and the subbands are affected by spin-orbit coupling, which is a consequence of the asymmetry of the confining potential. The electron-like and hole-like states are mainly confined in different quantum wells, and the enhanced hybridization between them opens a spin-dependent hybridization gap at a finite in-plane wavevector. We show that both the ratio of the widths of the two quantum wells and the mole fraction of the C d x H g 1 - x Te barrier control both the energy gap between the hole-like states and the hybridization gap. The energy subbands are shown to exhibit inverted ordering, and therefore, a nontrivial topological phase could emerge in the system. © 2020 Author(s).
T2  - Journal of Applied Physics
T1  - Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field
VL  - 128
IS  - 6
DO  - 10.1063/5.0016069
ER  - 

@article{
author = "Topalović, Dušan and Arsoski, Vladimir V. and Tadić, Milan Ž. and Peeters, Francois M.",
year = "2020",
abstract = "We investigate the electron states in double asymmetric HgTe / Cd x Hg 1 - x Te quantum wells grown along the [001] direction. The subbands are computed by means of the envelope function approximation applied to the eight-band Kane k ⋅ p model. The asymmetry of the confining potential of the double quantum wells results in a gap opening, which is absent in the symmetric system where it can only be induced by an applied electric field. The bandgap and the subbands are affected by spin-orbit coupling, which is a consequence of the asymmetry of the confining potential. The electron-like and hole-like states are mainly confined in different quantum wells, and the enhanced hybridization between them opens a spin-dependent hybridization gap at a finite in-plane wavevector. We show that both the ratio of the widths of the two quantum wells and the mole fraction of the C d x H g 1 - x Te barrier control both the energy gap between the hole-like states and the hybridization gap. The energy subbands are shown to exhibit inverted ordering, and therefore, a nontrivial topological phase could emerge in the system. © 2020 Author(s).",
journal = "Journal of Applied Physics",
title = "Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field",
volume = "128",
number = "6",
doi = "10.1063/5.0016069"
}

Topalović, D., Arsoski, V. V., Tadić, M. Ž.,& Peeters, F. M.. (2020). Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field. in Journal of Applied Physics, 128(6).
https://doi.org/10.1063/5.0016069

Topalović D, Arsoski VV, Tadić MŽ, Peeters FM. Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field. in Journal of Applied Physics. 2020;128(6).
doi:10.1063/5.0016069 .

Topalović, Dušan, Arsoski, Vladimir V., Tadić, Milan Ž., Peeters, Francois M., "Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field" in Journal of Applied Physics, 128, no. 6 (2020),
https://doi.org/10.1063/5.0016069 . .

TY  - JOUR
AU  - Topalović, Dušan
AU  - Davidović, Miloš D.
AU  - Jovanović, Maja
AU  - Bartonova, Alena
AU  - Ristovski, Zoran
AU  - Jovašević-Stojanović, Milena
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8372
AB  - The current compliance networks of automatic air-quality monitoring stations in large urban environments are not sufficient to provide spatial and temporal measurement resolution for realistic assessment of personal exposure to pollutants. Small low-cost sensor platforms with greater mobility and expected lower maintenance costs, are increasingly being used as a supplement to compliance monitoring stations. However, low-cost sensor platforms usually provide data with uncertain precision. To improve the precision, these sensor platforms require in-field calibration. Our paper aims to demonstrate that data from each individual sensor system can be corrected using that sensor system's own data to achieve much improved data quality compared to a reference. However, in this procedure, there are practical difficulties such as individual sensor outputs from the multi-sensor system not being sufficiently available due to malfunctions for instance. We explore how this can be dealt with. In our opinion, this is a novel approach, of practical importance both to users and manufacturers. We present a detailed comparative analysis of Linear Regression (univariate), Multivariate Linear Regression and Artificial Neural Networks used with a specific aim of calibrating field-deployed low-cost CO and O3 sensors. For Artificial Neural Network models, the performance of three common training algorithms was compared (Levenberg-Marquardt, Resilient back-propagation and Conjugate Gradient Powell-Beale algorithm). Data for this study were obtained from two campaigns conducted with 25 multi-sensor AQMESH v.3.5 platforms used within the activities of the CITI-SENSE project. The platforms were co-located to reference gas monitors at the Automatic Monitoring Station Stari Grad, in Belgrade, Serbia. This paper demonstrates that Multivariate Linear Regression and Artificial Neural Network calibration models can improve the output signal. This improvement can be measured by changes in the median and interquartile ranges of statistical parameters used for model evaluation. Artificial Neural Networks showed the best results compared to Linear Regression and Multivariate Linear Regression models. The best predictors for CO, in addition to CO low-cost sensor data, were PM2.5 and NO2, while for O3, in addition to O3 low-cost sensor data, the most suitable input predictors were NO and aH. Based on residual error analysis, we have shown that for CO and O3, a certain range of concentrations exists in which calibrated values differ by less than 10% from the reference method results. In addition, it was noted that for all models, CO sensors consistently showed lower variability between platforms compared to O3 sensors. © 2019 Elsevier Ltd
T2  - Atmospheric Environment
T1  - In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches
VL  - 213
SP  - 640
EP  - 658
DO  - 10.1016/j.atmosenv.2019.06.028
ER  - 

@article{
author = "Topalović, Dušan and Davidović, Miloš D. and Jovanović, Maja and Bartonova, Alena and Ristovski, Zoran and Jovašević-Stojanović, Milena",
year = "2019",
abstract = "The current compliance networks of automatic air-quality monitoring stations in large urban environments are not sufficient to provide spatial and temporal measurement resolution for realistic assessment of personal exposure to pollutants. Small low-cost sensor platforms with greater mobility and expected lower maintenance costs, are increasingly being used as a supplement to compliance monitoring stations. However, low-cost sensor platforms usually provide data with uncertain precision. To improve the precision, these sensor platforms require in-field calibration. Our paper aims to demonstrate that data from each individual sensor system can be corrected using that sensor system's own data to achieve much improved data quality compared to a reference. However, in this procedure, there are practical difficulties such as individual sensor outputs from the multi-sensor system not being sufficiently available due to malfunctions for instance. We explore how this can be dealt with. In our opinion, this is a novel approach, of practical importance both to users and manufacturers. We present a detailed comparative analysis of Linear Regression (univariate), Multivariate Linear Regression and Artificial Neural Networks used with a specific aim of calibrating field-deployed low-cost CO and O3 sensors. For Artificial Neural Network models, the performance of three common training algorithms was compared (Levenberg-Marquardt, Resilient back-propagation and Conjugate Gradient Powell-Beale algorithm). Data for this study were obtained from two campaigns conducted with 25 multi-sensor AQMESH v.3.5 platforms used within the activities of the CITI-SENSE project. The platforms were co-located to reference gas monitors at the Automatic Monitoring Station Stari Grad, in Belgrade, Serbia. This paper demonstrates that Multivariate Linear Regression and Artificial Neural Network calibration models can improve the output signal. This improvement can be measured by changes in the median and interquartile ranges of statistical parameters used for model evaluation. Artificial Neural Networks showed the best results compared to Linear Regression and Multivariate Linear Regression models. The best predictors for CO, in addition to CO low-cost sensor data, were PM2.5 and NO2, while for O3, in addition to O3 low-cost sensor data, the most suitable input predictors were NO and aH. Based on residual error analysis, we have shown that for CO and O3, a certain range of concentrations exists in which calibrated values differ by less than 10% from the reference method results. In addition, it was noted that for all models, CO sensors consistently showed lower variability between platforms compared to O3 sensors. © 2019 Elsevier Ltd",
journal = "Atmospheric Environment",
title = "In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches",
volume = "213",
pages = "640-658",
doi = "10.1016/j.atmosenv.2019.06.028"
}

Topalović, D., Davidović, M. D., Jovanović, M., Bartonova, A., Ristovski, Z.,& Jovašević-Stojanović, M.. (2019). In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches. in Atmospheric Environment, 213, 640-658.
https://doi.org/10.1016/j.atmosenv.2019.06.028

Topalović D, Davidović MD, Jovanović M, Bartonova A, Ristovski Z, Jovašević-Stojanović M. In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches. in Atmospheric Environment. 2019;213:640-658.
doi:10.1016/j.atmosenv.2019.06.028 .

Topalović, Dušan, Davidović, Miloš D., Jovanović, Maja, Bartonova, Alena, Ristovski, Zoran, Jovašević-Stojanović, Milena, "In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches" in Atmospheric Environment, 213 (2019):640-658,
https://doi.org/10.1016/j.atmosenv.2019.06.028 . .

TY  - JOUR
AU  - Topalović, Dušan
AU  - Arsoski, Vladimir
AU  - Tadić, Milan Ž.
AU  - Peeters, François M.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8534
AB  - We investigate the electron states and optical absorption in square- and hexagonal-shaped two-dimensional (2D) HgTe quantum dots and quantum rings in the presence of a perpendicular magnetic field. The electronic structure is modeled by means of the sp3d5s∗ tight-binding method within the nearest-neighbor approximation. Both bulklike and edge states appear in the energy spectrum. The bulklike states in quantum rings exhibit Aharonov-Bohm oscillations in magnetic field, whereas no such oscillations are found in quantum dots, which is ascribed to the different topology of the two systems. When magnetic field varies, all the edge states in square quantum dots appear as quasibands composed of almost fully flat levels, whereas some edge states in quantum rings are found to oscillate with magnetic field. However, the edge states in hexagonal quantum dots are localized like in rings. The absorption spectra of all the structures consist of numerous absorption lines, which substantially overlap even for small line broadening. The absorption lines in the infrared are found to originate from transitions between edge states. It is shown that the magnetic field can be used to efficiently tune the optical absorption of HgTe 2D quantum dot and quantum ring systems. © 2019 American Physical Society.
T2  - Physical Review B
T1  - Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior
VL  - 100
IS  - 12
SP  - 125304
DO  - 10.1103/PhysRevB.100.125304
ER  - 

@article{
author = "Topalović, Dušan and Arsoski, Vladimir and Tadić, Milan Ž. and Peeters, François M.",
year = "2019",
abstract = "We investigate the electron states and optical absorption in square- and hexagonal-shaped two-dimensional (2D) HgTe quantum dots and quantum rings in the presence of a perpendicular magnetic field. The electronic structure is modeled by means of the sp3d5s∗ tight-binding method within the nearest-neighbor approximation. Both bulklike and edge states appear in the energy spectrum. The bulklike states in quantum rings exhibit Aharonov-Bohm oscillations in magnetic field, whereas no such oscillations are found in quantum dots, which is ascribed to the different topology of the two systems. When magnetic field varies, all the edge states in square quantum dots appear as quasibands composed of almost fully flat levels, whereas some edge states in quantum rings are found to oscillate with magnetic field. However, the edge states in hexagonal quantum dots are localized like in rings. The absorption spectra of all the structures consist of numerous absorption lines, which substantially overlap even for small line broadening. The absorption lines in the infrared are found to originate from transitions between edge states. It is shown that the magnetic field can be used to efficiently tune the optical absorption of HgTe 2D quantum dot and quantum ring systems. © 2019 American Physical Society.",
journal = "Physical Review B",
title = "Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior",
volume = "100",
number = "12",
pages = "125304",
doi = "10.1103/PhysRevB.100.125304"
}

Topalović, D., Arsoski, V., Tadić, M. Ž.,& Peeters, F. M.. (2019). Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior. in Physical Review B, 100(12), 125304.
https://doi.org/10.1103/PhysRevB.100.125304

Topalović D, Arsoski V, Tadić MŽ, Peeters FM. Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior. in Physical Review B. 2019;100(12):125304.
doi:10.1103/PhysRevB.100.125304 .

Topalović, Dušan, Arsoski, Vladimir, Tadić, Milan Ž., Peeters, François M., "Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior" in Physical Review B, 100, no. 12 (2019):125304,
https://doi.org/10.1103/PhysRevB.100.125304 . .

TY  - CONF
AU  - Topalović, Dušan
AU  - Arsoski, Vladimir V.
AU  - Tadić, Milan Ž.
AU  - Peeters, François M.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11878
AB  - The quantum spin Hall (QSH) effect is a unique phase of matter characterized by a pair of helical edge states protected by time-reversal symmetry. The existence of this phase was first theoretically proposed for graphene [1]. However, experiments showed that spin-orbit interaction in low-mass C atoms is too small to open an energy gap [2]. Therefore, greater attention is paid to materials that are composed of heavier atoms in which relativistic effects are more pronounced. A notable example is thin HgTe/CdTe quantum well (QW) where the QSH effect was theoretically predicted [3] and experimentally realized [4]. By using effective models it has been found that double symmetric HgTe/CdxHg1-xTe QW may also possess a topological nontrivial phase [5, 6]. Structures of this type exhibit interesting 3/2 pseudospin based physics similar to that in bilayer graphene without valley degeneracy [6]. We investigate the electronic properties of double asymmetric HgTe/CdxHg1-xTe QW with [001] orientation. The electronic structure is calculated within the framework of the Kane k · p theory [7]. We choose the common eight-band basis set that describes the coupling between the Γ6, Γ7, and Γ8 bands. We assumed that the model parameters change abruptly along the structure. Also, the difference between the valence bands in HgTe and CdTe is assumed to vary linearly with mole fraction. The theoretical model is based on the Burt envelope function approach on expansion in plane waves is used in our numerical calculations. The results obtained for the electronic structure indicate that a quantum phase transition can occur in asymmetric double QW when a perpendicular electric field is applied. Besides an external field the phase transition could be controlled by varying geometric parameters of the wells and the mole fraction in barriers.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
C3  - PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
T1  - Tunable quantum phase transitions in asymmetric HgTe/CdxHg1-xTe double quantum wells
SP  - 109
EP  - 109
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11878
ER  - 

@conference{
author = "Topalović, Dušan and Arsoski, Vladimir V. and Tadić, Milan Ž. and Peeters, François M.",
year = "2019",
abstract = "The quantum spin Hall (QSH) effect is a unique phase of matter characterized by a pair of helical edge states protected by time-reversal symmetry. The existence of this phase was first theoretically proposed for graphene [1]. However, experiments showed that spin-orbit interaction in low-mass C atoms is too small to open an energy gap [2]. Therefore, greater attention is paid to materials that are composed of heavier atoms in which relativistic effects are more pronounced. A notable example is thin HgTe/CdTe quantum well (QW) where the QSH effect was theoretically predicted [3] and experimentally realized [4]. By using effective models it has been found that double symmetric HgTe/CdxHg1-xTe QW may also possess a topological nontrivial phase [5, 6]. Structures of this type exhibit interesting 3/2 pseudospin based physics similar to that in bilayer graphene without valley degeneracy [6]. We investigate the electronic properties of double asymmetric HgTe/CdxHg1-xTe QW with [001] orientation. The electronic structure is calculated within the framework of the Kane k · p theory [7]. We choose the common eight-band basis set that describes the coupling between the Γ6, Γ7, and Γ8 bands. We assumed that the model parameters change abruptly along the structure. Also, the difference between the valence bands in HgTe and CdTe is assumed to vary linearly with mole fraction. The theoretical model is based on the Burt envelope function approach on expansion in plane waves is used in our numerical calculations. The results obtained for the electronic structure indicate that a quantum phase transition can occur in asymmetric double QW when a perpendicular electric field is applied. Besides an external field the phase transition could be controlled by varying geometric parameters of the wells and the mole fraction in barriers.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade",
journal = "PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts",
title = "Tunable quantum phase transitions in asymmetric HgTe/CdxHg1-xTe double quantum wells",
pages = "109-109",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11878"
}

Topalović, D., Arsoski, V. V., Tadić, M. Ž.,& Peeters, F. M.. (2019). Tunable quantum phase transitions in asymmetric HgTe/CdxHg1-xTe double quantum wells. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade., 109-109.
https://hdl.handle.net/21.15107/rcub_vinar_11878

Topalović D, Arsoski VV, Tadić MŽ, Peeters FM. Tunable quantum phase transitions in asymmetric HgTe/CdxHg1-xTe double quantum wells. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:109-109.
https://hdl.handle.net/21.15107/rcub_vinar_11878 .

Topalović, Dušan, Arsoski, Vladimir V., Tadić, Milan Ž., Peeters, François M., "Tunable quantum phase transitions in asymmetric HgTe/CdxHg1-xTe double quantum wells" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):109-109,
https://hdl.handle.net/21.15107/rcub_vinar_11878 .

TY  - CONF
AU  - Davidović, Miloš
AU  - Topalović, Dušan
AU  - Tasić, Viša
AU  - Jovašević-Stojanović, Milena
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12690
AB  - One of the most important factors for increasing usefulness and relevance of air pollution data on a personal level would certainly be an increase in its spatial resolution. Current state of affairs in air quality monitoring networks at state or local level is such that they typically provide a wealth of high resolution temporal data, but monitoring stations are on the other hand mainly located at a few strategically important places in urban area. This low spatial resolution is a big barrier towards providing personally relevant information to citizens which would then be able to answer questions such as: what is the level of air pollution on routes and places they frequent, what are the associated health risks, and finally what can they do about it and at what cost? Part of the solution to this complex puzzle may be in low-cost air quality sensors (LCS). LCS’s are an emerging technology and are now commercially available for gases, particulate matter and meteorological parameters in a wide variety of designs and capabilities. However, the data sets generated by devices composed of selected LCS are often of questionable data quality. There are some protocols for calibration LCS in laboratory and in the field, but such procedures are extensive and appropriate for testing performance only during sensor development, but are certainly not practically feasible for testing of each commercial LCS [1, 2]. Developing, optimizing, and refining experiments and statistical modelling techniques for LCS-AQ calibration and validation is the mandatory step on the route of obtaining reliable and meaningful data [3, 4]. This work elaborates an important part of LCS deployment – its effective calibration procedure. We will describe our current work on calibration procedures for sensors for gaseous pollutants: ozone and carbon monoxide and sensors for particulate matter. In validation campaigns described in this work we have used combination of quality checks and mid-level validation, together with several statistical modeling approaches in order to observe which sensors have desirable level of performance and to later derive calibration curves or more complex calibration models. Calibration models were based on simple linear regression (LR), multiple linear regression (MLR) and artificial neural networks (ANN). Mid-level validation of particulate matter low cost sensors was done via collocation with lab-grade instruments in laboratory office space in Institute Vinca and the results were collected for several weeks. Low cost instruments included two Sharp GP2Y1010AU0F compact optical dust sensors connected to Arduino platform (1 channel output), Alphasense CompactOPC sensor (16 channels from 0.38 to 17 μm) and Dylos DC1700 PM unit (2 channels corresponding to “large” and “small” particles). Lab grade instruments included TSI NanoScan SMPS Model 3910 and TSI Optical particle sizer 3330 (17 channels from 0.3um to 10um). Basic quality check of two Sharp sensors showed that they did not have malfunctions and are surprisingly reliable when used in combination with Arduino platform. Sharp sensors mutually correlate with correlation coefficient cc~0.98. In comparison with lab grade instruments, they correlate best with OPS first channel cc~0.75 and cc steadily declines for channels corresponding to larger particles. Dylos channels best correlate with OPS 0.5-0.721μm for “small” particles with cc~0.60, and with OPS 2.156 μm for “large” particles with cc~0.978. Best performing low cost sensor was certainly Alphasense OPC with cc over 0.90 for corresponding channels. Performed validation steps clearly show to which particulate matter size range individual sensor channels correspond, enabling one to derive meaningful calibration curves. LCS’s for gaseous pollutants were deployed within multi-sensor platform AQMesh. Platforms were collocated with Automatic Monitoring Station Stari Grad belonging to the State Network run by the Serbian Environmental Protection Agency (SEPA), in two 1-month periods in late summer and early autumn 2015. CO and O3 sensors in AQMesh platform passed low level validation (criteria was percentage of collected data), and were considered for development of calibration models. Choice of predictors for MLR and ANN models utilized both statistical reasoning and heuristics to avoid overfitting calibrated sensor with co-varying gas species. Improvements in sensor performance with sophisticated ANN models compared to LR were significant, resulting in relative residuals less than 15% for concentration of pollutant approximately ranging from 175 μg/m3  to 400 μg/m3 , while for O3 in the range from 40 μg/m3 to 120 μg/m3 .
PB  - Belgrade : Serbian Chemical Society
C3  - ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
T1  - Towards widespread adoption of low cost air quality sensors - a necessity for effective calibration procedures
SP  - 39
EP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12690
ER  - 

@conference{
author = "Davidović, Miloš and Topalović, Dušan and Tasić, Viša and Jovašević-Stojanović, Milena",
year = "2018",
abstract = "One of the most important factors for increasing usefulness and relevance of air pollution data on a personal level would certainly be an increase in its spatial resolution. Current state of affairs in air quality monitoring networks at state or local level is such that they typically provide a wealth of high resolution temporal data, but monitoring stations are on the other hand mainly located at a few strategically important places in urban area. This low spatial resolution is a big barrier towards providing personally relevant information to citizens which would then be able to answer questions such as: what is the level of air pollution on routes and places they frequent, what are the associated health risks, and finally what can they do about it and at what cost? Part of the solution to this complex puzzle may be in low-cost air quality sensors (LCS). LCS’s are an emerging technology and are now commercially available for gases, particulate matter and meteorological parameters in a wide variety of designs and capabilities. However, the data sets generated by devices composed of selected LCS are often of questionable data quality. There are some protocols for calibration LCS in laboratory and in the field, but such procedures are extensive and appropriate for testing performance only during sensor development, but are certainly not practically feasible for testing of each commercial LCS [1, 2]. Developing, optimizing, and refining experiments and statistical modelling techniques for LCS-AQ calibration and validation is the mandatory step on the route of obtaining reliable and meaningful data [3, 4]. This work elaborates an important part of LCS deployment – its effective calibration procedure. We will describe our current work on calibration procedures for sensors for gaseous pollutants: ozone and carbon monoxide and sensors for particulate matter. In validation campaigns described in this work we have used combination of quality checks and mid-level validation, together with several statistical modeling approaches in order to observe which sensors have desirable level of performance and to later derive calibration curves or more complex calibration models. Calibration models were based on simple linear regression (LR), multiple linear regression (MLR) and artificial neural networks (ANN). Mid-level validation of particulate matter low cost sensors was done via collocation with lab-grade instruments in laboratory office space in Institute Vinca and the results were collected for several weeks. Low cost instruments included two Sharp GP2Y1010AU0F compact optical dust sensors connected to Arduino platform (1 channel output), Alphasense CompactOPC sensor (16 channels from 0.38 to 17 μm) and Dylos DC1700 PM unit (2 channels corresponding to “large” and “small” particles). Lab grade instruments included TSI NanoScan SMPS Model 3910 and TSI Optical particle sizer 3330 (17 channels from 0.3um to 10um). Basic quality check of two Sharp sensors showed that they did not have malfunctions and are surprisingly reliable when used in combination with Arduino platform. Sharp sensors mutually correlate with correlation coefficient cc~0.98. In comparison with lab grade instruments, they correlate best with OPS first channel cc~0.75 and cc steadily declines for channels corresponding to larger particles. Dylos channels best correlate with OPS 0.5-0.721μm for “small” particles with cc~0.60, and with OPS 2.156 μm for “large” particles with cc~0.978. Best performing low cost sensor was certainly Alphasense OPC with cc over 0.90 for corresponding channels. Performed validation steps clearly show to which particulate matter size range individual sensor channels correspond, enabling one to derive meaningful calibration curves. LCS’s for gaseous pollutants were deployed within multi-sensor platform AQMesh. Platforms were collocated with Automatic Monitoring Station Stari Grad belonging to the State Network run by the Serbian Environmental Protection Agency (SEPA), in two 1-month periods in late summer and early autumn 2015. CO and O3 sensors in AQMesh platform passed low level validation (criteria was percentage of collected data), and were considered for development of calibration models. Choice of predictors for MLR and ANN models utilized both statistical reasoning and heuristics to avoid overfitting calibrated sensor with co-varying gas species. Improvements in sensor performance with sophisticated ANN models compared to LR were significant, resulting in relative residuals less than 15% for concentration of pollutant approximately ranging from 175 μg/m3  to 400 μg/m3 , while for O3 in the range from 40 μg/m3 to 120 μg/m3 .",
publisher = "Belgrade : Serbian Chemical Society",
journal = "ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts",
title = "Towards widespread adoption of low cost air quality sensors - a necessity for effective calibration procedures",
pages = "39-40",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12690"
}

Davidović, M., Topalović, D., Tasić, V.,& Jovašević-Stojanović, M.. (2018). Towards widespread adoption of low cost air quality sensors - a necessity for effective calibration procedures. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
Belgrade : Serbian Chemical Society., 39-40.
https://hdl.handle.net/21.15107/rcub_vinar_12690

Davidović M, Topalović D, Tasić V, Jovašević-Stojanović M. Towards widespread adoption of low cost air quality sensors - a necessity for effective calibration procedures. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts. 2018;:39-40.
https://hdl.handle.net/21.15107/rcub_vinar_12690 .

Davidović, Miloš, Topalović, Dušan, Tasić, Viša, Jovašević-Stojanović, Milena, "Towards widespread adoption of low cost air quality sensors - a necessity for effective calibration procedures" in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts (2018):39-40,
https://hdl.handle.net/21.15107/rcub_vinar_12690 .

TY  - JOUR
AU  - Fishbain, Barak
AU  - Lerner, Uri
AU  - Castell, Nuria
AU  - Cole-Hunter, Tom
AU  - Popoola, Olalekan
AU  - Broday, David M.
AU  - Martinez Iniguez, Tania
AU  - Nieuwenhuijsen, Mark
AU  - Jovašević-Stojanović, Milena
AU  - Topalović, Dušan
AU  - Jones, Roderic L.
AU  - Galea, Karen S.
AU  - Etzion, Yael
AU  - Kizel, Fadi
AU  - Golumbic, Yaela N.
AU  - Baram-Tsabari, Ayelet
AU  - Yacobi, Tamar
AU  - Drahler, Dana
AU  - Robinson, Johanna A.
AU  - Kocman, David
AU  - Horvat, Milena
AU  - Svecova, Vlasta
AU  - Arpaci, Alexander
AU  - Bartonova, Alena
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1343
AB  - Recent developments in sensory and communication technologies have made the development of portable air-quality (AQ) micro-sensing units (MSUs) feasible. These MSUs allow AQ measurements in many new applications, such as ambulatory exposure analyses and citizen science. Typically, the performance of these devices is assessed using the mean error or correlation coefficients with respect to a laboratory equipment. However, these criteria do not represent how such sensors perform outside of laboratory conditions in large-scale field applications, and do not cover all aspects of possible differences in performance between the sensor-based and standardized equipment, or changes in performance over time. This paper presents a comprehensive Sensor Evaluation Toolbox (SET) for evaluating AQ MSUs by a range of criteria, to better assess their performance in varied applications and environments. Within the SET are included four new schemes for evaluating sensors capability to: locate pollution sources; represent the pollution level on a coarse scale; capture the high temporal variability of the observed pollutant and their reliability. Each of the evaluation criteria allows for assessing sensors performance in a different way, together constituting a holistic evaluation of the suitability and usability of the sensors in a wide range of applications. Application of the SET on measurements acquired by 25MSUs deployed in eight cities across Europe showed that the suggested schemes facilitates a comprehensive cross platform analysis that can be used to determine and compare the sensors performance. The SET was implemented in R and the code is available on the first authors website. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Science of the Total Environment
T1  - An evaluation tool kit of air quality micro-sensing units
VL  - 575
SP  - 639
EP  - 648
DO  - 10.1016/j.scitotenv.2016.09.061
ER  - 

@article{
author = "Fishbain, Barak and Lerner, Uri and Castell, Nuria and Cole-Hunter, Tom and Popoola, Olalekan and Broday, David M. and Martinez Iniguez, Tania and Nieuwenhuijsen, Mark and Jovašević-Stojanović, Milena and Topalović, Dušan and Jones, Roderic L. and Galea, Karen S. and Etzion, Yael and Kizel, Fadi and Golumbic, Yaela N. and Baram-Tsabari, Ayelet and Yacobi, Tamar and Drahler, Dana and Robinson, Johanna A. and Kocman, David and Horvat, Milena and Svecova, Vlasta and Arpaci, Alexander and Bartonova, Alena",
year = "2017",
abstract = "Recent developments in sensory and communication technologies have made the development of portable air-quality (AQ) micro-sensing units (MSUs) feasible. These MSUs allow AQ measurements in many new applications, such as ambulatory exposure analyses and citizen science. Typically, the performance of these devices is assessed using the mean error or correlation coefficients with respect to a laboratory equipment. However, these criteria do not represent how such sensors perform outside of laboratory conditions in large-scale field applications, and do not cover all aspects of possible differences in performance between the sensor-based and standardized equipment, or changes in performance over time. This paper presents a comprehensive Sensor Evaluation Toolbox (SET) for evaluating AQ MSUs by a range of criteria, to better assess their performance in varied applications and environments. Within the SET are included four new schemes for evaluating sensors capability to: locate pollution sources; represent the pollution level on a coarse scale; capture the high temporal variability of the observed pollutant and their reliability. Each of the evaluation criteria allows for assessing sensors performance in a different way, together constituting a holistic evaluation of the suitability and usability of the sensors in a wide range of applications. Application of the SET on measurements acquired by 25MSUs deployed in eight cities across Europe showed that the suggested schemes facilitates a comprehensive cross platform analysis that can be used to determine and compare the sensors performance. The SET was implemented in R and the code is available on the first authors website. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Science of the Total Environment",
title = "An evaluation tool kit of air quality micro-sensing units",
volume = "575",
pages = "639-648",
doi = "10.1016/j.scitotenv.2016.09.061"
}

Fishbain, B., Lerner, U., Castell, N., Cole-Hunter, T., Popoola, O., Broday, D. M., Martinez Iniguez, T., Nieuwenhuijsen, M., Jovašević-Stojanović, M., Topalović, D., Jones, R. L., Galea, K. S., Etzion, Y., Kizel, F., Golumbic, Y. N., Baram-Tsabari, A., Yacobi, T., Drahler, D., Robinson, J. A., Kocman, D., Horvat, M., Svecova, V., Arpaci, A.,& Bartonova, A.. (2017). An evaluation tool kit of air quality micro-sensing units. in Science of the Total Environment, 575, 639-648.
https://doi.org/10.1016/j.scitotenv.2016.09.061

Fishbain B, Lerner U, Castell N, Cole-Hunter T, Popoola O, Broday DM, Martinez Iniguez T, Nieuwenhuijsen M, Jovašević-Stojanović M, Topalović D, Jones RL, Galea KS, Etzion Y, Kizel F, Golumbic YN, Baram-Tsabari A, Yacobi T, Drahler D, Robinson JA, Kocman D, Horvat M, Svecova V, Arpaci A, Bartonova A. An evaluation tool kit of air quality micro-sensing units. in Science of the Total Environment. 2017;575:639-648.
doi:10.1016/j.scitotenv.2016.09.061 .

Fishbain, Barak, Lerner, Uri, Castell, Nuria, Cole-Hunter, Tom, Popoola, Olalekan, Broday, David M., Martinez Iniguez, Tania, Nieuwenhuijsen, Mark, Jovašević-Stojanović, Milena, Topalović, Dušan, Jones, Roderic L., Galea, Karen S., Etzion, Yael, Kizel, Fadi, Golumbic, Yaela N., Baram-Tsabari, Ayelet, Yacobi, Tamar, Drahler, Dana, Robinson, Johanna A., Kocman, David, Horvat, Milena, Svecova, Vlasta, Arpaci, Alexander, Bartonova, Alena, "An evaluation tool kit of air quality micro-sensing units" in Science of the Total Environment, 575 (2017):639-648,
https://doi.org/10.1016/j.scitotenv.2016.09.061 . .