基于蒙特卡罗方法的复合材料辐射屏蔽设计北大核心CSCD

在乏燃料后处理厂的工作环境中可能存在着低能中子-γ射线混合辐射,严重威胁工作人员的人身安全。本文针对上述混合辐射环境,利用蒙特卡罗程序Geant4模拟计算了一种钨/硼纤维增强含硼/铋聚合物复合材料中不同材料参数对低能中子和γ射线综合防护效果的影响。结果显示,此种钨/硼纤维复合材料对低能中子和γ射线均具有良好的屏蔽效果。文章证实了纤维垂直排布方式具有比平行排布方式更优的屏蔽效果,且垂直排布方式下透过粒子束的强度分布更加均匀。此外,在聚合物基体中掺杂一定质量分数的硼/铋可以进一步增强复合材料的辐射屏蔽效果。依据这些结果我们认为此种复合材料可以为后处理厂等辐射环境中的防护服及相关防护用具提供参考。

Shielding design of radiation resistant composite material based on Monte Carlo method

Mixed low-energy neutron andγ-ray radiations may exist in the working environment of the spent fuel reprocessing plants,which threatens the health of staff.In this work,Monte Carlo simulations based on Geant4 software is applied to assist the design of composite materials,i.e.,tungsten/boron fibers in the polymer substrate containing boron and bismuth,for shielding such mixed radiations by simulating the effects of various material parameters.The results show that this tungsten-boron composite material has an excellent shielding effect for both neutron andγ-ray radiations.It can be proved that the vertical arrangement of fibers has better shielding effect than parallel arrangement,since the distribution of transmission beam became more uniform when the fibers were arranged vertically.Moreover,the shielding effectiveness of this material can be further enhanced by adding bismuth into the polymer substrate.These findings can be expected to provide guidance not only for radiation protection suits,but also other relevant protective gears used in the radiation environment,such as reprocessing plants.