9MeV行波电子直线加速器屏蔽设计与评价

DESIGN AND EVALUATION FOR THE SHIELDING SYSTEM OF THE 9 MeV TRAVELLING WAVE LINEAR ELECTRON ACCELERATOR

采用 Monte Carlo模拟计算程序 EGS4 ,对海关大型集装箱检测系统用的 9Me V行波电子直线加速器的机头和机房屏蔽进行了计算和辐射模拟分析 ,并分别与经验公式计算数据和实测值进行了比较。结果表明 ,在加速器机房内外主要参考点上 ,用 EGS4程序计算得到的剂量当量率与实测结果符合较好 ,为 EGS4的灵活应用提供了范例。

We use EGS4 code, a generally known Monte Carlo computer simulation package, to carry out the simulation analysis of the radiation dose distribution around the head shielding system and inside the accelerator hall of the 9 MeV travelling wave linear electron accelerator. The accelerator is used for the large container inspecting system. The comparison of experience formulae evaluation and practical data was made. The results show that, at the main reference points in the accelerator hall, the dose calculated by EGS4 is well coincided with the results measured. It serves as a good example for flexible application of EGS4.