石墨转水相关暑期工作

1、60CO源不同准直条件下束流模拟李涛 龚晓明1.意义2.模拟程序简介3.建模4.结果5.结论及未来工作outline意义 医用伽马刀所用的野为小野，计量院60Co源的视野为大野，为了让校准工作和医疗情况更接近，故模拟研究在计量院60Co源前加各种形状及大小的准直器情况下束流能谱变化及野的分布。BEAMnrc相关程序界面模拟程序简介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 .建模计量院60Co源无外加准直模型计量院60Co源外加直径4mm圆柱型准直器的模型计量院60Co源外加开口直径4mm结尾6mm锥型准直器模型计量院60Co源外加开口直径6mm结尾4mm锥型准直器模型无准直下1m处能谱结果r0.2_r0.3准直下1m处能谱无准直情况下1m处束流随半径的变化r0.2_r0.3准直情况下1m处束流随半径的变化结论及未来工作 通过准直可以明显限制野的大小，对能谱的影