Impact of Cross Sections Data Implemented in DOSXYZnrc Code on Dose Distributions and Efficiency for a 12 MV Linac

The goal of this study is to investigate the effect and influence of cross-sections data, implemented in DOSXYZnrc Monte Carlo code, on the dose distributions data such as beam dose profiles and percentage depth dose, and it influences on the efficiency. This study was performed in tow phases: the commissioning of Phase Space files generated by SATURNE 43 for 12 MV and the analysis of these Phase Space files by using different cross section implemented DOSXYZnrc code. A SATURNE 43 linear accelerator head’s has been modeled with BEAMnrc Monte Carlo code to simulate a 12 MV photon beam on a square field size of × 10 cm ^2 . Phase Space files for the SATURNE 43 photon beam were created by using the EGSnrc BEAMnrc system. The Phase Space files was scored below the botom jaws and used as input in simulation using DOSXYZnrc. The calculated results established that the percentage depth dose curves, beam profiles dose and efficiency are less sensitive to photon, pair, and Bremsstrahlung cross-sections data available in DOSXYZnrc code.