基于SuperMC对结构缝隙影响中子屏蔽的研究  

Effects of material structural gaps on neutron shielding using SuperMC

作　　者：孟宪芳[1] 张龙[1] 孙超[1] 王士军 曹可 马慧玲[1] 秦培中[1] MENG Xianfang;ZHANG Long;SUN Chao;WANG Shijun;CAO Ke;MA Huiling;QIN Peizhong(Beijing Research Center for Radiation Application Beijing Key Laboratory of Radiation Advanced Materials,Beijing 100015)

机构地区：[1]北京市射线应用研究中心,辐射新材料北京市重点实验室,北京100015

出　　处：《辐射防护》2018年第4期265-269,共5页Radiation Protection

摘　　要：本文基于Monte Carlo粒子输运计算程序SuperMC,计算了四种含硼聚乙烯(B-PE)结构缝隙对两种谱中子的衰减倍数。为了便于比较不同结构缝隙对中子屏蔽性能的影响,统一与相同厚度无缝隙材料相比得到中子衰减倍数相对减小量,并在相同条件下对计算结果进行了实验验证。结果表明:对于厚度6 cm的B-PE材料,斜缝结构的快中子衰减倍数相对减小量为直缝结构的1/8,斜缝结构的慢化中子衰减倍数相对减小量为直缝结构的1/3,斜缝结构对中子屏蔽产生的负面影响最小。Neutron attenuation ratios of four different structural gaps on two kinds of spectrum neutrons were calculated using Super MC（ Super Monte Carlo Program for Nuclear and Radiation Simulation）. The structural gaps were made of boron polyethylene（ B-PE） materials. In order to study the effect of different gaps on neutron shielding performance,they were compared with seamless materials and the relative reductions of neutron attenuation ratios were obtained. Some simulation results were verified by the experiments under the same conditions. The results showed that,for the B-PE materials with a thickness of 6 cm,the relative reduction of neutron attenuation ratio is 1/8 on fast neurons by comparing of oblique gap with straight gap. That is 1/3 on slowing down neutrons. Oblique gap is proved to have the least negative effect on neutron shielding.

关 键 词：结构缝隙 中子能谱 衰减倍数 SuperMC程序 

分 类 号：TL72[核科学技术—辐射防护及环境保护]