涂硼电离室组合快中子探测器研制及其响应函数  

Design and Response Function of Fast Neutron Detector Using Boron-lined Ionization Chamber

作　　者：张紫霞[1] 魏志勇[1] 方美华[1] 朱立[1] 陈国云[2] 石苗[1] 

机构地区：[1]南京航空航天大学,江苏南京210016 [2]南昌大学,江西南昌330031

出　　处：《原子能科学技术》2014年第7期1274-1280,共7页Atomic Energy Science and Technology

基　　金：江苏省2011年度普通高校研究生科研创新计划项目资助(CXLX11_0192)

摘　　要：研制了涂硼电离室组合快中子探测器。用外径分别为55、80、130、220、285mm的5个高密度聚乙烯圆柱体作为快中子的慢化体包裹40mm×200mm的涂硼电离室,组合成一种可测量从热中子到十几MeV快中子的圆柱型Bonner探测器。借助Geant4蒙特卡罗方法模拟计算,给出了这种结构Bonner探测器探测系统的响应函数。将圆柱型Bonner探测器放置在标准中子源辐射场中进行了实验测量。在实际辐射场中,高密度聚乙烯圆柱体外径为220mm时,圆柱型Bonner探测器的灵敏度达8.702×10-15 A·cm2·s。同时对实验测量值与理论模拟结果进行了比较分析。结果表明,模拟结果与实验值在数据读取误差范围内吻合。The fast neutron detector using boron-lined ionization chamber was deve-loped .The Bonner multi-cylinder neutron detector consists of a φ40 mm × 200 mm boron-lined ionization chamber clading with high density polyethylene cylinder ,which was used as fast neutron moderate and with external diameters of 55 ,80 ,130 ,220 and 285 mm .The energy range of neutrons is broad ,extending from thermal neutron to tens MeV fast neutron .The response function of Bonner multi-cylinder neutron detector was simulated by Geant4 code .The experiments based on the standard neutron source were done .While the outer diameter of high density polyethylene is 220 mm ,the neu-tron sensitivity of Bonner multi-cylinder neutron detector reaches a level of 8.702 ×10-15 A · cm2 · s under experimental conditions .The experimental data were compared with the simulation results .It is show n that the simulation results are accordant with experiment results in observation data error .

关 键 词：快中子 响应函数 GEANT4 涂硼电离室 灵敏度 

分 类 号：TL816.3[核科学技术—核技术及应用]