Journal of Radiation Safety and Measurement

Journal of Radiation Safety and Measurement

Investigating the effect of changes in the dimensions of high dose rate brachytherapy sources on dosimetry quantities using GEANT4

Document Type : Original Article

Authors
Shahnaz Shafie 1
Ali Asghar Mowlavi 2
Zahra Sadat Sajjadi 1
1 Department of Physics, Payame Noor Universiy, Po Box 19395-3697 Tehran, Iran
2 Department of Physics, Hakim Sabzevari University, Sabzevar, Iran
10.22052/rsm.2026.256960.1130
Abstract
In this study, the BEBIG standard source was simulated in the GEANT4 Monte Carlo tools and the two-dimensional dose distribution was calculated. Then, the geometry factor was calculated for the linear source and the cylindrical source. In the standard BEBIG source, a dimensional change was created without changing the volume with constant activity, and with the new design, the geometry factor was calculated for the linear source and the cylindrical source. For both sources, given the source dose rate and cylindrical geometry function, the anisotropy function and radial dose function were calculated. The dose rate for both the standard BEBIG and the scaled-up BEBIG sources is very high near them and this value decreases as the distance from the sources increases. The geometry factor in the Monte Carlo calculation method for the BEBIG source is necessary when the given dimensions are changed, but it is approximated for the standard BEBIG source. At close distances from the source, the anisotropy is greatly reduced; therefore, the dose distribution to the target tumors is more uniform.
Keywords
BEBIG source
Dosimetry quantities
GEANT4
TG-43U1 protocol
Geometry factor
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