中子辐照铅硼聚乙烯致次级γ剂量模拟研究

摘要

利用MCNP程序,研究了铅硼聚乙烯材料成分、入射中子的能量以及屏蔽材料的厚度对次级γ剂量占总剂量比例的影响.结果表明:随着入射中子能量的增大,次级γ剂量对总剂量的贡献不断降低;随着屏蔽材料厚度的增加,次级γ剂量对总剂量的贡献不断升高,且均受铅硼聚乙烯材料成分的影响.研究结果可供中子源屏蔽设计参考.%The impact on the ratio of the secondary γ dose to the total dose from the composition of the lead boron polyethylenel,the energy of the incident neutrons and the thickness of the shielding material were studied by dint of the MCNP. The results show that:the contribution of the secondary γ dose to the total dose decrease with the increase of the incident neutron energy,and the contribution of the secondary γ dose to the total dose increase with the increase of the thickness of the shielding material,and all of this are affected by the composition of lead boron polyethylene. The results in this study provide refrence for the shield design of neutron source.