蒙特卡罗程序EGS4在γ照射量积累因子计算中的应用  

Application of Monte Carlo Code EGS4 to Calculate Gamma Exposure Buildup Factors

作　　者：张雷[1] 赵兵[1] 王学新[1] 

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《辐射防护》2011年第2期88-93,共6页Radiation Protection

摘　　要：使用蒙特卡罗程序EGS4计算了入射光子能量范围从0.015 MeV到15 MeV、屏蔽厚度达到40个平均自由程的普通混凝土的γ照射量积累因子,程序计算中使用的是PHOTX光子截面库、各向同性点源和无限均匀介质模型,针对深穿透问题采用了粒子分裂技巧,并考虑了轫致辐射、荧光效应和相干(瑞利)散射对积累因子的影响。并将本文的计算结果与相关文献进行了比较分析,表明本文使用EGS4计算的积累因子数据是可靠的,可以更广泛的使用蒙特卡罗方法来计算γ照射量积累因子。Exposure buildup factors up to 40 mean free paths ranging from 0.015 MeV to 15 MeV photon energy were calculated by using the Monte Carlo simulation code EGS4 for ordinary concrete.The calculation involves PHOTX cross section library,a point isotropic source,infinite uniform medium model and a particle splitting method and consideres the bremsstrahlung,fluorescent effect,correlative（Rayleigh） scatter.The results were compared with the relevant data.Results show that the data of the buildup factors calculated by the Monte Carlo code EGS4 was reliable.The Monte Carlo method can be used widely to calculate gamma-ray exposure buildup factors.

关 键 词：屏蔽 积累因子 蒙特卡罗方法 EGS4 混凝土 

分 类 号：X34[环境科学与工程—环境工程]