用于n-γ混合场屏蔽的复合材料性能  

Composite shielding materials for neutrons and induced γ rays

作　　者：衷斌[1] 曾志[1] 余纲林[1] 王学武[1] 王侃[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2013年第10期1369-1373,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(11175099)

摘　　要：清华微型脉冲强子源(CPHS)靶站屏蔽设计需同时考虑屏蔽不同能量中子和γ射线。为了在有限空间内达到放射性防护的要求,CPHS研制了一种复合辐射屏蔽材料。该材料利用环氧树脂和环氧树脂固化剂将聚乙烯颗粒、无水硼砂和纯铅粒有机结合在一起,浇筑成型,弥补了单一屏蔽材料对混合源屏蔽效率低的缺点。利用Monte Carlo程序对比研究了新复合材料、聚乙烯和铅对14MeV、1MeV及25.3meV中子及次级γ射线的屏蔽性能。结果表明,研制的混合屏蔽材料对各种能量中子及其次级γ射线的屏蔽效果均优于单一材料。The shielding design of compact pulsed hadron source （CPHS） target stations should consider both neutrons and ~/ rays with different energies. To provide this radiation shielding in a limited space, a new kind of composite shielding materials is developed using an epoxy resin to bond polyethylene beads, anhydrous borax, and lead shot. The composites attenuate neutrons and neutron-induced γ rays more efficiently than a single material. Monte Carlo evaluations of the shielding ability of the composites, polyethylene, and lead for 14 MeV, 1 MeV, and 25.3 meV neutrons show that the composites provide better shielding than either single material for the neutrons and the induced γ rays.

关 键 词：防放射性材料 中子和γ屏蔽 微型脉冲强子源 

分 类 号：TU596[建筑科学—建筑技术科学]