薄壁快脉冲^252Cf裂变电离室的研制及性能测试  

Design and Test of a Thin Wall and Fast Pulse ^(252)Cf Ionization Chamber

作　　者：顾先宝[1] 黎光武[1] 张文慧[1,2] 张刚[1,2] 陈宇[1] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]兰州大学核科学与技术学院,甘肃兰州730000

出　　处：《原子核物理评论》2009年第1期37-40,共4页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(10475068,10476018)~~

摘　　要：介绍了用于中子探测器效率刻度的薄壁快脉冲252Cf裂变电离室。在用飞行时间法测量中子能谱时,该裂变电离室能够给出252Cf裂变中子发射时刻信号,输出脉冲上升时间约为5.5 ns,电离室由厚度为0.15 mm的不锈钢构成。测试结果表明,对裂变碎片的探测效率为99.2%,α粒子脉冲幅度和碎片脉冲幅度可清晰分开。A thin wall, fast pulse ^252 Cf ionization chamber, which was designed for calibrating efficiency of neutron detectors, was described. The ionization chamber can be used as the start detector in time-of-flight measurements of the ^252Cf fission neutron spectrum. The chamber is composed of 0.15 mm thick stainless steel, the rise time of pulse signals is about 5.5 ns. As the test result shows, the detection efficiency of fission fragments is 99.2%, and pulse signals caused by fissions are distinguished clearly from those caused by α decays.

关 键 词：效率刻度 252Cf裂变电离室 飞行时间法 

分 类 号：TL811.1[核科学技术—核技术及应用]