TY  - JOUR
AU  - Petrović, Nina
AU  - Krestic-Vesovic, Jelena
AU  - Stojanovic, Darko
AU  - Ciraj-Bjelac, Olivera
AU  - Lazarević, Đorđe R.
AU  - Kovačević, Milojko
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4224
AB  - When high-energy photon beams are used for irradiation in radiotherapy, neutrons that are the result of photonuclear reactions create activation products that affect the occupational dose of radiotherapy staff. For the assessment of activation products in situ gamma spectroscopy was performed parallel to dose-rate measurements following irradiation, by using a high-energy photon beam from a linear accelerator Elekta Precise (Elekta, Stockholm, Sweden) used in radiotherapy. The major identified activation products were the following radioisotopes: (28)Al, (24)Na, (56)Mn, (54)Mn, (187)W, (64)Cu and (62)Cu. Based on the typical workload and dose-rate measurement, the assessed additional annual occupational dose ranged from 1.7 to 0.25 mSv. As the measured dose rate arising from the activation products rapidly decreases as a function of time, the assessed additional dose is negligible after 10 min following irradiation. To keep the occupational dose as low as reasonably achievable, it is recommended to delay entrance to the therapy room at least 2-4 min, when high-energy photons are used. This would reduce the effective dose by 30 %.
T2  - Radiation Protection Dosimetry
T1  - Contribution of Activation Products to Occupational Exposure Following Treatment Using High-Energy Photons in Radiotherapy
VL  - 143
IS  - 1
SP  - 109
EP  - 112
DO  - 10.1093/rpd/ncq290
ER  - 

@article{
author = "Petrović, Nina and Krestic-Vesovic, Jelena and Stojanovic, Darko and Ciraj-Bjelac, Olivera and Lazarević, Đorđe R. and Kovačević, Milojko",
year = "2011",
abstract = "When high-energy photon beams are used for irradiation in radiotherapy, neutrons that are the result of photonuclear reactions create activation products that affect the occupational dose of radiotherapy staff. For the assessment of activation products in situ gamma spectroscopy was performed parallel to dose-rate measurements following irradiation, by using a high-energy photon beam from a linear accelerator Elekta Precise (Elekta, Stockholm, Sweden) used in radiotherapy. The major identified activation products were the following radioisotopes: (28)Al, (24)Na, (56)Mn, (54)Mn, (187)W, (64)Cu and (62)Cu. Based on the typical workload and dose-rate measurement, the assessed additional annual occupational dose ranged from 1.7 to 0.25 mSv. As the measured dose rate arising from the activation products rapidly decreases as a function of time, the assessed additional dose is negligible after 10 min following irradiation. To keep the occupational dose as low as reasonably achievable, it is recommended to delay entrance to the therapy room at least 2-4 min, when high-energy photons are used. This would reduce the effective dose by 30 %.",
journal = "Radiation Protection Dosimetry",
title = "Contribution of Activation Products to Occupational Exposure Following Treatment Using High-Energy Photons in Radiotherapy",
volume = "143",
number = "1",
pages = "109-112",
doi = "10.1093/rpd/ncq290"
}

Petrović, N., Krestic-Vesovic, J., Stojanovic, D., Ciraj-Bjelac, O., Lazarević, Đ. R.,& Kovačević, M.. (2011). Contribution of Activation Products to Occupational Exposure Following Treatment Using High-Energy Photons in Radiotherapy. in Radiation Protection Dosimetry, 143(1), 109-112.
https://doi.org/10.1093/rpd/ncq290

Petrović N, Krestic-Vesovic J, Stojanovic D, Ciraj-Bjelac O, Lazarević ĐR, Kovačević M. Contribution of Activation Products to Occupational Exposure Following Treatment Using High-Energy Photons in Radiotherapy. in Radiation Protection Dosimetry. 2011;143(1):109-112.
doi:10.1093/rpd/ncq290 .

Petrović, Nina, Krestic-Vesovic, Jelena, Stojanovic, Darko, Ciraj-Bjelac, Olivera, Lazarević, Đorđe R., Kovačević, Milojko, "Contribution of Activation Products to Occupational Exposure Following Treatment Using High-Energy Photons in Radiotherapy" in Radiation Protection Dosimetry, 143, no. 1 (2011):109-112,
https://doi.org/10.1093/rpd/ncq290 . .

TY  - JOUR
AU  - Davidović, Dragomir A.
AU  - Vukanić, Jovan V.
AU  - Arsenović, Dušan
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3370
AB  - The Chandrasekhars H functions play a central role in theoretical descriptions of radiative transfer in planetary and stellar atmospheres. In the present work our aim is to obtain in a simple way new analytic approximations of the Chandrasekhars function for isotropic scattering, which would be sufficiently simple but more accurate than the existing approximations. We apply the mean value theorem for definite integrals in the nonlinear integral equation for the Chandrasekhars H function. In this way the integral equation is formally solved but the solution depends on a new unknown parameter. We determine this parameter approximately, from the condition that the obtained H function matches the zero-order moment of the H function, which is known exactly, as accurately as possible in the whole range of the single particle albedo. The result gives our first analytic approximation for the H function. Using it as a starting approximation in the corresponding integral equation, after only one iteration which may be performed analytically, we obtain our second analytic approximation. The maximum relative error of our first analytic. approximation, which is very simple in structure, is below 2.5%. The accuracy of our second approximation is within 0.07%, so that it highly surpasses the accuracy of the other analytic approximations available in the literature. (c) 2007 Elsevier Inc. All rights reserved.
T2  - Icarus
T1  - Two new analytic approximations of the Chandrasekhars H function for isotropic scattering
VL  - 194
IS  - 1
SP  - 389
EP  - 397
DO  - 10.1016/j.icarus.2007.09.024
ER  - 

@article{
author = "Davidović, Dragomir A. and Vukanić, Jovan V. and Arsenović, Dušan",
year = "2008",
abstract = "The Chandrasekhars H functions play a central role in theoretical descriptions of radiative transfer in planetary and stellar atmospheres. In the present work our aim is to obtain in a simple way new analytic approximations of the Chandrasekhars function for isotropic scattering, which would be sufficiently simple but more accurate than the existing approximations. We apply the mean value theorem for definite integrals in the nonlinear integral equation for the Chandrasekhars H function. In this way the integral equation is formally solved but the solution depends on a new unknown parameter. We determine this parameter approximately, from the condition that the obtained H function matches the zero-order moment of the H function, which is known exactly, as accurately as possible in the whole range of the single particle albedo. The result gives our first analytic approximation for the H function. Using it as a starting approximation in the corresponding integral equation, after only one iteration which may be performed analytically, we obtain our second analytic approximation. The maximum relative error of our first analytic. approximation, which is very simple in structure, is below 2.5%. The accuracy of our second approximation is within 0.07%, so that it highly surpasses the accuracy of the other analytic approximations available in the literature. (c) 2007 Elsevier Inc. All rights reserved.",
journal = "Icarus",
title = "Two new analytic approximations of the Chandrasekhars H function for isotropic scattering",
volume = "194",
number = "1",
pages = "389-397",
doi = "10.1016/j.icarus.2007.09.024"
}

Davidović, D. A., Vukanić, J. V.,& Arsenović, D.. (2008). Two new analytic approximations of the Chandrasekhars H function for isotropic scattering. in Icarus, 194(1), 389-397.
https://doi.org/10.1016/j.icarus.2007.09.024

Davidović DA, Vukanić JV, Arsenović D. Two new analytic approximations of the Chandrasekhars H function for isotropic scattering. in Icarus. 2008;194(1):389-397.
doi:10.1016/j.icarus.2007.09.024 .

Davidović, Dragomir A., Vukanić, Jovan V., Arsenović, Dušan, "Two new analytic approximations of the Chandrasekhars H function for isotropic scattering" in Icarus, 194, no. 1 (2008):389-397,
https://doi.org/10.1016/j.icarus.2007.09.024 . .

TY  - CONF
AU  - Ilić, Radovan
AU  - Marinković, Predrag
AU  - Stanković, Srboljub
AU  - Kaljević, Jelica
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12261
AB  - U simulaciji prolaza čestica tehnikama Monte Karlo aktuelni geometrijski moduli upotrebljavaju površine prvog i drugog reda (FOTELP, PENELOPE, SHIELD, GEANT), a nekad i četvrtog reda(MCNP5), da opišu složene geometrijske forme.. Sve veća primena tehnika Monte Karlo u medicini oslanja se na vokselizovane geometrijske forme koje se dobijaju vokselizaciom fantoma ili iz CT podataka. Ogroman broj tela (voxela) u tom slučaju otežava primenu konstruktivne geometrije. Eefikasniji pristup tom problemu zasniva se na primeni virtuelnog voksela.Ovde se saopštavaju rezultati upotrebe virtuelnog voksela na anatomiju tela i organa upotrebom CT podataka.
AB  - Geometry modules in particle transport simulation codes with Monte Carlo techniques use surfaces of first and second order, sometimes even a fourth order surfaces, to be able to describe complex geometrical shapes. Constructive quadric geometry dominates in all leading software packages. Increasing application of Monte Carlo techniques in medicine is associated with voxelized geometry forms. Huge number of bodies present in this case makes the use of constructive geometry more difficult. The paper describes an efficient approach to this problem by virtual voxel application, where optical distance to the boundary is obtained, and 3D voxel indices give information about the materials present in voxel.
PB  - Beograd : Institut za nuklearne nauke "Vinča" : Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - 24. simpozijum DZZSCG : zbornik radova
T1  - Primena virtuelng voksela pri upotrebi CT podataka u modelovanju trajektorije čestice tehnikama Monte Karlo
T1  - Usage of virtual voxel with CT data in particles trajectory modeling by Monte Carlo techniques
SP  - 233
EP  - 237
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12261
ER  - 

@conference{
author = "Ilić, Radovan and Marinković, Predrag and Stanković, Srboljub and Kaljević, Jelica",
year = "2007",
abstract = "U simulaciji prolaza čestica tehnikama Monte Karlo aktuelni geometrijski moduli upotrebljavaju površine prvog i drugog reda (FOTELP, PENELOPE, SHIELD, GEANT), a nekad i četvrtog reda(MCNP5), da opišu složene geometrijske forme.. Sve veća primena tehnika Monte Karlo u medicini oslanja se na vokselizovane geometrijske forme koje se dobijaju vokselizaciom fantoma ili iz CT podataka. Ogroman broj tela (voxela) u tom slučaju otežava primenu konstruktivne geometrije. Eefikasniji pristup tom problemu zasniva se na primeni virtuelnog voksela.Ovde se saopštavaju rezultati upotrebe virtuelnog voksela na anatomiju tela i organa upotrebom CT podataka., Geometry modules in particle transport simulation codes with Monte Carlo techniques use surfaces of first and second order, sometimes even a fourth order surfaces, to be able to describe complex geometrical shapes. Constructive quadric geometry dominates in all leading software packages. Increasing application of Monte Carlo techniques in medicine is associated with voxelized geometry forms. Huge number of bodies present in this case makes the use of constructive geometry more difficult. The paper describes an efficient approach to this problem by virtual voxel application, where optical distance to the boundary is obtained, and 3D voxel indices give information about the materials present in voxel.",
publisher = "Beograd : Institut za nuklearne nauke "Vinča" : Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "24. simpozijum DZZSCG : zbornik radova",
title = "Primena virtuelng voksela pri upotrebi CT podataka u modelovanju trajektorije čestice tehnikama Monte Karlo, Usage of virtual voxel with CT data in particles trajectory modeling by Monte Carlo techniques",
pages = "233-237",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12261"
}

Ilić, R., Marinković, P., Stanković, S.,& Kaljević, J.. (2007). Primena virtuelng voksela pri upotrebi CT podataka u modelovanju trajektorije čestice tehnikama Monte Karlo. in 24. simpozijum DZZSCG : zbornik radova
Beograd : Institut za nuklearne nauke "Vinča" : Društvo za zaštitu od zračenja Srbije i Crne Gore., 233-237.
https://hdl.handle.net/21.15107/rcub_vinar_12261

Ilić R, Marinković P, Stanković S, Kaljević J. Primena virtuelng voksela pri upotrebi CT podataka u modelovanju trajektorije čestice tehnikama Monte Karlo. in 24. simpozijum DZZSCG : zbornik radova. 2007;:233-237.
https://hdl.handle.net/21.15107/rcub_vinar_12261 .

Ilić, Radovan, Marinković, Predrag, Stanković, Srboljub, Kaljević, Jelica, "Primena virtuelng voksela pri upotrebi CT podataka u modelovanju trajektorije čestice tehnikama Monte Karlo" in 24. simpozijum DZZSCG : zbornik radova (2007):233-237,
https://hdl.handle.net/21.15107/rcub_vinar_12261 .