Pages: 312-317

Authors: Wan Duo, Wang Shuahua, Omar Medhat Mostafa, and Moustafa Elsayed Medhat

Abstract

This study investigates a novel ¹²⁵I radiotherapy source. It evaluates its dosimetric parameters using Monte Carlo simulation around the source, following the updated American Association of Physicists in Medicine Task Group recommendations. For this new source configuration, the dose rate constant Λ, geometry function G(r, Ө), radial dose function gL(r), and anisotropy function F(r,Ө), were determined using Geant4 Monte Carlo simulations. Additionally, a comparison of the obtained dosimetric parameters with those of an earlier ¹²⁵I source model was conducted to analyze the shadowing effect between the two designs during multi-source brachytherapy implants.

Key words: brachytherapy, Geant4, Monte Carlo simulation, capsule structure

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