Abstract:Purpose: The purpose of this study was to examine RBE variation as a function of distance from the radioactive source, and the potential impact of this variation on a realistic prostate brachytherapy treatment plan. Methods: Three brachytherapy sources ( 125 I, 192 Ir, and 169 Yb) were modelled in Geant4 Monte Carlo code, and the resulting electron energy spectrum in water in 3D space around these sources was scored (voxel size of 2 mm 3 ). With this energy spectrum, microdosimetric techniques were used to ca… Show more
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