TY  - JOUR
AU  - Ljubenov, Vladan
AU  - Simović, Rodoljub D.
AU  - Marković, Srpko
AU  - Ilić, Radovan D.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4120
AB  - The possibility of expressing the total particle and energy reflection coefficients of low-energy photons in the form of universal functions valid for different shielding materials is investigated in this paper. The analysis is based on the results of Monte Carlo simulations of photon reflection by using MCNP, FOTELP, and PENELOPE codes. The normal incidence of the narrow monoenergetic photon beam of the unit intensity and of initial energies from 20 keV up to 100 keV is considered, and particle and energy reflection coefficients from the plane homogenous targets of water, aluminum, and iron are determined and compared. The representations of albedo coefficients on the initial photon energy, on the probability of large-angle photon scattering, and on the mean number of photon scatterings are examined. It is found out that only the rescaled albedo coefficients dependent on the mean number of photon scatterings have the form of universal functions and these functions are determined by applying the least square method.
T2  - Nuclear technology and radiation protection
T1  - Total Reflection Coefficients of Low-Energy Photons Presented as Universal Functions
VL  - 25
IS  - 2
SP  - 100
EP  - 106
DO  - 10.2298/NTRP1002100L
ER  - 

@article{
author = "Ljubenov, Vladan and Simović, Rodoljub D. and Marković, Srpko and Ilić, Radovan D.",
year = "2010",
abstract = "The possibility of expressing the total particle and energy reflection coefficients of low-energy photons in the form of universal functions valid for different shielding materials is investigated in this paper. The analysis is based on the results of Monte Carlo simulations of photon reflection by using MCNP, FOTELP, and PENELOPE codes. The normal incidence of the narrow monoenergetic photon beam of the unit intensity and of initial energies from 20 keV up to 100 keV is considered, and particle and energy reflection coefficients from the plane homogenous targets of water, aluminum, and iron are determined and compared. The representations of albedo coefficients on the initial photon energy, on the probability of large-angle photon scattering, and on the mean number of photon scatterings are examined. It is found out that only the rescaled albedo coefficients dependent on the mean number of photon scatterings have the form of universal functions and these functions are determined by applying the least square method.",
journal = "Nuclear technology and radiation protection",
title = "Total Reflection Coefficients of Low-Energy Photons Presented as Universal Functions",
volume = "25",
number = "2",
pages = "100-106",
doi = "10.2298/NTRP1002100L"
}

Ljubenov, V., Simović, R. D., Marković, S.,& Ilić, R. D.. (2010). Total Reflection Coefficients of Low-Energy Photons Presented as Universal Functions. in Nuclear technology and radiation protection, 25(2), 100-106.
https://doi.org/10.2298/NTRP1002100L

Ljubenov V, Simović RD, Marković S, Ilić RD. Total Reflection Coefficients of Low-Energy Photons Presented as Universal Functions. in Nuclear technology and radiation protection. 2010;25(2):100-106.
doi:10.2298/NTRP1002100L .

Ljubenov, Vladan, Simović, Rodoljub D., Marković, Srpko, Ilić, Radovan D., "Total Reflection Coefficients of Low-Energy Photons Presented as Universal Functions" in Nuclear technology and radiation protection, 25, no. 2 (2010):100-106,
https://doi.org/10.2298/NTRP1002100L . .

TY  - JOUR
AU  - Ljubenov, Vladan
AU  - Simović, Rodoljub
AU  - Marković, Srpko
AU  - Ilić, Radovan D.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3540
AB  - The dependence of reflected photons angular and energy distributions on parameter c - the probability for large-angle scattering - is treated in this paper. The simulation of photon reflection was performed by the FOTELP code for a normal incidence of photons into infinite slabs of common shielding materials, and for the photon initial energies of 20 keV up to 100 keV.
T2  - Nuclear technology and radiation protection
T1  - Photon Scattering and Reflection in Medical Diagnostic Energy Domain
VL  - 23
IS  - 1
SP  - 31
EP  - 36
DO  - 10.2298/NTRP0801031L
ER  - 

@article{
author = "Ljubenov, Vladan and Simović, Rodoljub and Marković, Srpko and Ilić, Radovan D.",
year = "2008",
abstract = "The dependence of reflected photons angular and energy distributions on parameter c - the probability for large-angle scattering - is treated in this paper. The simulation of photon reflection was performed by the FOTELP code for a normal incidence of photons into infinite slabs of common shielding materials, and for the photon initial energies of 20 keV up to 100 keV.",
journal = "Nuclear technology and radiation protection",
title = "Photon Scattering and Reflection in Medical Diagnostic Energy Domain",
volume = "23",
number = "1",
pages = "31-36",
doi = "10.2298/NTRP0801031L"
}

Ljubenov, V., Simović, R., Marković, S.,& Ilić, R. D.. (2008). Photon Scattering and Reflection in Medical Diagnostic Energy Domain. in Nuclear technology and radiation protection, 23(1), 31-36.
https://doi.org/10.2298/NTRP0801031L

Ljubenov V, Simović R, Marković S, Ilić RD. Photon Scattering and Reflection in Medical Diagnostic Energy Domain. in Nuclear technology and radiation protection. 2008;23(1):31-36.
doi:10.2298/NTRP0801031L .

Ljubenov, Vladan, Simović, Rodoljub, Marković, Srpko, Ilić, Radovan D., "Photon Scattering and Reflection in Medical Diagnostic Energy Domain" in Nuclear technology and radiation protection, 23, no. 1 (2008):31-36,
https://doi.org/10.2298/NTRP0801031L . .

TY  - JOUR
AU  - Ciraj-Bjelac, Olivera
AU  - Marković, Srpko
AU  - Košutić, Duško D.
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6509
AB  - Patient doses for barium meal examination performed at three general hospitals, in Serbia and Montenegro were measured using a kerma-area product (KAP) meter. The results were analysed in order to obtain dose-related parameters. Although the observed doses were within the range reported in other studies, intra-hospital and inter-hospital dose variations were significant. Mean KAP values for total examination in three hospitals were 8.4, 24.4 and 13.9 Gy cm(2), respectively. Contribution from fluoroscopy was greater than from radiography. Factors contributing to the increased dose delivery were determined and the recommendations on radiographic techniques were made. Changes, in radiography settings allowed dose reduction up to 48% in the radiographic part of examination, that is. up to 12% in total dose without loss of image quality. In addition, fluoroscopy time was noted as the second major contributor to the dose variations. The results demonstrated the need for standardisation of practice for barium meal examination in the country.
T2  - Radiation Protection Dosimetry
T1  - Patient doses for barium meal examination in Serbia and Montenegro and potentials for dose reduction through changes in equipment settings
VL  - 114
IS  - 1-3
SP  - 158
EP  - 163
DO  - 10.1093/rpd/nch531
ER  - 

@article{
author = "Ciraj-Bjelac, Olivera and Marković, Srpko and Košutić, Duško D.",
year = "2005",
abstract = "Patient doses for barium meal examination performed at three general hospitals, in Serbia and Montenegro were measured using a kerma-area product (KAP) meter. The results were analysed in order to obtain dose-related parameters. Although the observed doses were within the range reported in other studies, intra-hospital and inter-hospital dose variations were significant. Mean KAP values for total examination in three hospitals were 8.4, 24.4 and 13.9 Gy cm(2), respectively. Contribution from fluoroscopy was greater than from radiography. Factors contributing to the increased dose delivery were determined and the recommendations on radiographic techniques were made. Changes, in radiography settings allowed dose reduction up to 48% in the radiographic part of examination, that is. up to 12% in total dose without loss of image quality. In addition, fluoroscopy time was noted as the second major contributor to the dose variations. The results demonstrated the need for standardisation of practice for barium meal examination in the country.",
journal = "Radiation Protection Dosimetry",
title = "Patient doses for barium meal examination in Serbia and Montenegro and potentials for dose reduction through changes in equipment settings",
volume = "114",
number = "1-3",
pages = "158-163",
doi = "10.1093/rpd/nch531"
}

Ciraj-Bjelac, O., Marković, S.,& Košutić, D. D.. (2005). Patient doses for barium meal examination in Serbia and Montenegro and potentials for dose reduction through changes in equipment settings. in Radiation Protection Dosimetry, 114(1-3), 158-163.
https://doi.org/10.1093/rpd/nch531

Ciraj-Bjelac O, Marković S, Košutić DD. Patient doses for barium meal examination in Serbia and Montenegro and potentials for dose reduction through changes in equipment settings. in Radiation Protection Dosimetry. 2005;114(1-3):158-163.
doi:10.1093/rpd/nch531 .

Ciraj-Bjelac, Olivera, Marković, Srpko, Košutić, Duško D., "Patient doses for barium meal examination in Serbia and Montenegro and potentials for dose reduction through changes in equipment settings" in Radiation Protection Dosimetry, 114, no. 1-3 (2005):158-163,
https://doi.org/10.1093/rpd/nch531 . .