تعیین ویژگیهای دزیمتری چشمه های براکی تراپی کم انرژی بر اساس دستور کارTG- ۴۳U۱ با روشهای مختلف محاسبه دز در کد MCNP

Application of low energy ۱۲۵I and ۱۰۳Pd sources in prostate cancer brachytherapy has been considerably increased, recently. Accordingly, the Nuclear Research Center for Agriculture and Medicine (NRCAM) has selected the production of ۱۰۳Pd source seeds and their characterization as one of its main objectives. In this investigation, we have calculated TG-۴۳U۱ dosimetry parameters for a source similar to the primary NRCAM design, using MCNP Monte Carlo computer code with F۴, F۶ and *F۸ tallies. The results have been compared with the corresponding values reported in the literature and for most of the cases, all the three tallies and the reported values are in good agreement. It has been found that the F۶ tally is about ۲۰ times faster than *F۸ tally without any considerable loss of accuracy. Therefore, it is concluded that for design analysis purposes, the F۶ tally is adequately efficient to perform cumbersome recursive brachytherapy seed design calculations.

Keywords:

براکی تراپی , MCNP , دستور کار TG-۴۳U۱ , محاسبات دز , I۱۲۵ , Pd۱۰۳ , پروستات , روش مونت کارلو , کدهای کامپیوتری