Monte Carlo calculations of the dosimetry parameters for the ~(125)I brachytherapy source

For obtaining dose distribution characters the dosimetry parameters of the Model IS12501 ~ 125 I brachytherapy source were calculated using a Monte Carlo simulation based on the dose calculation formalism recommended by AAPM TG43U1. The calculated dose rate constant, 0.959cGy·h~ -1 ·U~ -1 , was within 2.02% of the TG43U1 recommended value. The radial dose distribution also agreed with the TG43U1 standard for 0.110.0 cm from the source. The anisotropy function was also compiled for clinical practice with the far field dose distribution (10 cm×10 cm). The results are also used to determine correlations for the radial dose function and the anisotropy function.