Monte Carlo simulation of radiation transport are to play a role as important in calculating the dose distribution. The system of EGS (Electron-Gamma-shower) of the computer code is a software package for the Monte Carlo simulation of transportation along the electrons and photons in an arbitrary shape for particles of energy on a few keV up to several hundred GeV. Monte Carlo simulation can be used to get the characteristics of clinical beam that can not get by measuring. The information of beams necessary not only for clinical dosimetry but also for the development of the algorithm for calculating the correct dose in the treatment planning system (TPS). The coding system was DOSXYZnrc and BEAMnrc widely used code Monte Carlo radiotherapy beam simulation and to calculate the dose distribution in phantom or in patients [1, 2]. A simulation of the photon beam is produced by the HPD linac was made use of BEAMnrc code. BEAMnrc is a system Monte Carlo simulation to model the radiation source has been developed as part of the OMEGA project to develop 3-d treatment plans for radiation therapy (with the University of Wisconsin). BEAMnrc is built on the code EGSnrc system [2]. Details (such as location, cost, and energy) of all the particles leave the station has been stored in a data file space stage. DOSXYZnrc [1] is a person using EGSnrc code to calculate the dose in the voxel Cartesian and is directly on the DOSXYZ code developed for the EGS4 code system. The space stage files obtained with BEAMnrc was used as the input source to DOSXYZnrc to simulate the distribution of dose in a water phantom. This study aims to provide a method to determine the parameters of the initial beam when it leaves the foot and into the goal. This was done by comparing calculated and measured values that best fit in the percentage depth dose (PDD) and beam profile (OCR) for the size 10 x 10 cm 2 fields.
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