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辐照型电子直线加速器的应用已经越来越广泛,但是其辐射屏蔽优化一直是需要解决的问题,所以设计出既经济又有效的屏蔽方法是非常有意义的。本文叙述了对一台10 MeV的辐照型电子直线加速器迷道出口的剂量率所进行的经验公式计算和蒙特卡罗(Monte Carlo,Fluka)模拟,结合伽马探测器和微型数据采集器Mini-DDL(Mini Digital Data Logging)的连续实时测量结果进行了对比分析。分析结果显示,只要在迷道门处增加一个拐弯,就增加一次反散射,出口处的剂量率会下降一个量级以上,使其不仅低于剂量限值而且合理地达到尽可能低。这个结果是在基本没有增加额外成本的基础上实现的,符合辐射防护ALARA(as low as reasonably achievable)原则,为以后加速器的屏蔽设计提供了很好的参考。
The application of irradiation electron linear accelerator has been more and more widespread, but its radiation shielding optimization has always been a problem to be solved. Therefore, it is very meaningful to design an economical and effective shielding method. This paper describes empirical formula calculation and Monte Carlo (Fluka) simulation of the dose rate of a 10 MeV irradiated electron linear accelerator exit. Combined with a gamma detector and a miniature data collector Mini -DDL (Mini Digital Data Logging) continuous real-time measurement results were compared. The results of the analysis showed that once a bend was added at the door of the dogleg, there was an additional backscatter, and the dose rate at the exit would drop by more than an order of magnitude not only below the dose limit but also reasonably as low as possible. This result is based on the principle of ALARA (as low as reasonably achievable) without any additional cost, which provides a good reference for future shield design of accelerators.