基于n-γ反应的中子探头设计  

Design of neutron detector head based on the n-γ reaction

作　　者：李如松[1] 何彬[1] 肖舟[1] 张全虎[1] 付广智[1] 

机构地区：[1]第二炮兵工程学院,西安710025

出　　处：《清华大学学报（自然科学版）》2007年第z1期972-974,共3页Journal of Tsinghua University(Science and Technology)

摘　　要：为了使用现有γ谱仪探测中子,设计了一种n-γ反应中子探头。构建几何模型,利用MCNP4B程序,仿真中子在轻材料中的输运过程。根据仿真计算结果以及物质形态的要求,选定聚乙烯作为探头的最佳组成材料。描绘了聚乙烯厚度均匀增加时(n,γ)反应截面的变化规律,同时在综合考虑了中子探测效率、中子对探头损伤作用、测量误差以及中子散射作用等因素后,最终确定探头的底厚和壁厚最佳尺寸均是7.0 cm。The objective of this work is to detect neutrons using the exiting γ spectrum apparatuses.The MCNP software was used to simulate neutron-gamma reaction in a realistic geometric model to identify an appropriate material with a large(n,γ) cross section.Polyethene was chosen for the detector head based on the calculated results,the material state,and the manufacturing requirements.The final detector head has the bottom and the side wall thicknesses of 7.0 cm considering the neutron detection efficiency,the damages of neutron to the detector,the measurement error and the scattering effect of neutron.

关 键 词：反应截面 MONTE Carlo仿真 聚乙烯 

分 类 号：TL214[核科学技术—核燃料循环与材料]