TY  - JOUR
AU  - Ajtić, Jelena V.
AU  - Zorko, Benjamin
AU  - Nečemer, Marijan
AU  - Sarvan, Darko Z.
AU  - Rajačić, Milica
AU  - Krneta-Nikolić, Jelena D.
AU  - Todorović, Dragana
AU  - Đurđević, Vladimir S.
AU  - Vodenik, Branko
AU  - Glavič-Cindro, Denis
AU  - Kožar Logar, Jasmina Koar
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10075
AB  - This study investigates the beryllium-7, lead-210 and caesium-137 activity concentrations in aerosol filter samples collected monthly along the 45°N zonal belt over 1991–2019. Sampling was performed in three locations, one in Serbia and two in Slovenia, and the Slovenian data records are published here for the first time. The activity concentrations were determined by standard gamma spectrometry. The obtained results are in general agreement with the literature data for Europe. The data sets at different sites display similarities in measurement ranges, overall means and seasonal cycles. Still, statistical tests show significant differences among the radionuclides’ concentrations across the locations. To investigate underlying processes that affect radioactivity in the surface air in this region, multivariate statistical concepts are applied to the radionuclides’ concentrations and local meteorological parameters. Discriminant analysis shows that all three sites are well separated from each other. Principal component analysis gives common pattern of interconnection between the observables: temperature has a stronger influence on the behaviour of beryllium-7 and lead-210 than that of caesium-137, but a negative correlation of the radionuclides’ concentrations with precipitation seems the strongest for caesium-137. Principal component analysis also shows local differences in the degree of relationship between the meteorological parameters and activity concentrations of the investigated radionuclides. This is an important finding for future atmospheric transport studies.
T2  - International Journal of Environmental Science and Technology
T1  - Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe
DO  - 10.1007/s13762-021-03814-0
ER  - 

@article{
author = "Ajtić, Jelena V. and Zorko, Benjamin and Nečemer, Marijan and Sarvan, Darko Z. and Rajačić, Milica and Krneta-Nikolić, Jelena D. and Todorović, Dragana and Đurđević, Vladimir S. and Vodenik, Branko and Glavič-Cindro, Denis and Kožar Logar, Jasmina Koar",
year = "2021",
abstract = "This study investigates the beryllium-7, lead-210 and caesium-137 activity concentrations in aerosol filter samples collected monthly along the 45°N zonal belt over 1991–2019. Sampling was performed in three locations, one in Serbia and two in Slovenia, and the Slovenian data records are published here for the first time. The activity concentrations were determined by standard gamma spectrometry. The obtained results are in general agreement with the literature data for Europe. The data sets at different sites display similarities in measurement ranges, overall means and seasonal cycles. Still, statistical tests show significant differences among the radionuclides’ concentrations across the locations. To investigate underlying processes that affect radioactivity in the surface air in this region, multivariate statistical concepts are applied to the radionuclides’ concentrations and local meteorological parameters. Discriminant analysis shows that all three sites are well separated from each other. Principal component analysis gives common pattern of interconnection between the observables: temperature has a stronger influence on the behaviour of beryllium-7 and lead-210 than that of caesium-137, but a negative correlation of the radionuclides’ concentrations with precipitation seems the strongest for caesium-137. Principal component analysis also shows local differences in the degree of relationship between the meteorological parameters and activity concentrations of the investigated radionuclides. This is an important finding for future atmospheric transport studies.",
journal = "International Journal of Environmental Science and Technology",
title = "Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe",
doi = "10.1007/s13762-021-03814-0"
}

Ajtić, J. V., Zorko, B., Nečemer, M., Sarvan, D. Z., Rajačić, M., Krneta-Nikolić, J. D., Todorović, D., Đurđević, V. S., Vodenik, B., Glavič-Cindro, D.,& Kožar Logar, J. K.. (2021). Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe. in International Journal of Environmental Science and Technology.
https://doi.org/10.1007/s13762-021-03814-0

Ajtić JV, Zorko B, Nečemer M, Sarvan DZ, Rajačić M, Krneta-Nikolić JD, Todorović D, Đurđević VS, Vodenik B, Glavič-Cindro D, Kožar Logar JK. Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe. in International Journal of Environmental Science and Technology. 2021;.
doi:10.1007/s13762-021-03814-0 .

Ajtić, Jelena V., Zorko, Benjamin, Nečemer, Marijan, Sarvan, Darko Z., Rajačić, Milica, Krneta-Nikolić, Jelena D., Todorović, Dragana, Đurđević, Vladimir S., Vodenik, Branko, Glavič-Cindro, Denis, Kožar Logar, Jasmina Koar, "Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe" in International Journal of Environmental Science and Technology (2021),
https://doi.org/10.1007/s13762-021-03814-0 . .

TY  - JOUR
AU  - Ajtić, Jelena V.
AU  - Todorović, Dragana
AU  - Krneta-Nikolić, Jelena D.
AU  - Đurđević, Vladimir S.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5888
AB  - Activities of Be-7 and Pb-210 were monitored in surface air in Belgrade, Serbia, from 2004 to 2012. The measurements were taken from two locations, in an open field of a city suburb and in the central city area. The activities were determined on HPGe detectors by standard gamma spectrometry. The Be-7 activity shows a pronounced seasonal pattern, with the maximum in spring-summer and minimum in winter, while the Pb-210 activity exhibits two maxima, in autumn and late winter. The mean monthly concentrations measured at both sites are below 9 mBq/m(3) and 1.3 mBq/m(3) for Be-7 and Pb-210, respectively. The obtained correlation of the Be-7 activity with the number of sun-spots is not statistically significant. Relations of the radionuclides activities with climate variables (precipitation, temperature, relative humidity, cloud cover, sunshine hours, and atmospheric pressure) are also investigated, but the only significant correlations are found for the Be-7 activity with temperature and sunshine hours, and the Pb-210 activity with atmospheric pressure. The maximum Be-7 and Pb-210 activities corresponding to binned total monthly precipitation data imply different modes of the radionuclide scavenging from the atmosphere. During dry periods, accumulation of the radionuclides in the atmosphere leads to their increased activities, but no correlation was found between the activities and the number of consecutive dry days.
T2  - Nuclear technology and radiation protection
T1  - A Multi-Year Study of Radioactivity in Surface Air and Its Relation to Climate Variables in Belgrade, Serbia
VL  - 28
IS  - 4
SP  - 381
EP  - 388
DO  - 10.2298/NTRP1304381A
ER  - 

@article{
author = "Ajtić, Jelena V. and Todorović, Dragana and Krneta-Nikolić, Jelena D. and Đurđević, Vladimir S.",
year = "2013",
abstract = "Activities of Be-7 and Pb-210 were monitored in surface air in Belgrade, Serbia, from 2004 to 2012. The measurements were taken from two locations, in an open field of a city suburb and in the central city area. The activities were determined on HPGe detectors by standard gamma spectrometry. The Be-7 activity shows a pronounced seasonal pattern, with the maximum in spring-summer and minimum in winter, while the Pb-210 activity exhibits two maxima, in autumn and late winter. The mean monthly concentrations measured at both sites are below 9 mBq/m(3) and 1.3 mBq/m(3) for Be-7 and Pb-210, respectively. The obtained correlation of the Be-7 activity with the number of sun-spots is not statistically significant. Relations of the radionuclides activities with climate variables (precipitation, temperature, relative humidity, cloud cover, sunshine hours, and atmospheric pressure) are also investigated, but the only significant correlations are found for the Be-7 activity with temperature and sunshine hours, and the Pb-210 activity with atmospheric pressure. The maximum Be-7 and Pb-210 activities corresponding to binned total monthly precipitation data imply different modes of the radionuclide scavenging from the atmosphere. During dry periods, accumulation of the radionuclides in the atmosphere leads to their increased activities, but no correlation was found between the activities and the number of consecutive dry days.",
journal = "Nuclear technology and radiation protection",
title = "A Multi-Year Study of Radioactivity in Surface Air and Its Relation to Climate Variables in Belgrade, Serbia",
volume = "28",
number = "4",
pages = "381-388",
doi = "10.2298/NTRP1304381A"
}

Ajtić, J. V., Todorović, D., Krneta-Nikolić, J. D.,& Đurđević, V. S.. (2013). A Multi-Year Study of Radioactivity in Surface Air and Its Relation to Climate Variables in Belgrade, Serbia. in Nuclear technology and radiation protection, 28(4), 381-388.
https://doi.org/10.2298/NTRP1304381A

Ajtić JV, Todorović D, Krneta-Nikolić JD, Đurđević VS. A Multi-Year Study of Radioactivity in Surface Air and Its Relation to Climate Variables in Belgrade, Serbia. in Nuclear technology and radiation protection. 2013;28(4):381-388.
doi:10.2298/NTRP1304381A .

Ajtić, Jelena V., Todorović, Dragana, Krneta-Nikolić, Jelena D., Đurđević, Vladimir S., "A Multi-Year Study of Radioactivity in Surface Air and Its Relation to Climate Variables in Belgrade, Serbia" in Nuclear technology and radiation protection, 28, no. 4 (2013):381-388,
https://doi.org/10.2298/NTRP1304381A . .