用 EGS4 分析 9 MeV 行波直线加速器屏蔽系统

USING EGS4 TO ANALYZE THE SHIELDING SYSTEM OF 9 MeV TRAVELLING WAVE LINEAR ACCELERATOR

采用了国际上广泛使用的ＭｏｎｔｅＣａｒｌｏ模拟计算程序ＥＧＳ４对海关集装箱检测系统用加速器屏蔽系统进行了辐射模拟分析，与实际测试数据进行分析、比较，解释了特殊剂量分布的原因，提出了系统改进的参考方案。

EGS4 code, a general known Monte Carlo computer simulation package, is introduced in this paper. The application of EGS4 to simulate the radiation dose distribution of the accelerator shielding system for a large object radiation inspecting system(LORIS) is described in the paper. The results obtained by EGS4 are compared with the experiment.Explanation of exceptional dose distribution is given. A new design feature is presented.