石墨轉(zhuǎn)水相關(guān)暑期工作

1、60CO源不同準(zhǔn)直條件下束流模擬李濤 龔曉明1.意義2.模擬程序簡介3.建模4.結(jié)果5.結(jié)論及未來工作outline意義 醫(yī)用伽馬刀所用的野為小野，計量院60Co源的視野為大野，為了讓校準(zhǔn)工作和醫(yī)療情況更接近，故模擬研究在計量院60Co源前加各種形狀及大小的準(zhǔn)直器情況下束流能譜變化及野的分布。BEAMnrc相關(guān)程序界面模擬程序簡介Abstract BEAMnrc is a Monte Carlo simulation system for modelling radiotherapy sources which was developed as part of the OMEGA projec

2、t to develop 3-D treatment planning for radiotherapy (with the University of Wisconsin). BEAMnrc is built on the EGSnrc Code System1. Until 2004, BEAMnrc could only be run on Unix/Linux systems. However, with the recent port of BEAMnrc to the EGSnrcMP system2, BEAMnrc can also run on Windows-based s

3、ystems. It discusses how to use the various variance reduction techniques which are part of the system, most importantly, range rejection, bremsstrahlung splitting, photon forcing in a specific region and Russian Roulette. It also covers the structure of the directory system used for the BEAMnrc sys

4、tem, the utility codes available (readphsp, addphsp,checkCM8 etc.), the installation procedure, the phase space file definition and it has crossreferences to all related BEAMnrc .建模計量院60Co源無外加準(zhǔn)直模型計量院60Co源外加直徑4mm圓柱型準(zhǔn)直器的模型計量院60Co源外加開口直徑4mm結(jié)尾6mm錐型準(zhǔn)直器模型計量院60Co源外加開口直徑6mm結(jié)尾4mm錐型準(zhǔn)直器模型無準(zhǔn)直下1m處能譜結(jié)果r0.2_r0.3準(zhǔn)直下1m處能譜無準(zhǔn)直情況下1m處束流隨半徑的變化r0.2_r0.3準(zhǔn)直情況下1m處束流隨半徑的變化結(jié)論及未來工作 通過準(zhǔn)直可以明顯限制野的大小，對能譜的影