狭缝式高灵敏裂变中子探测系统  

A high sensitive fission neutron detector system with a lead slot collimator

作　　者：欧阳晓平[1] 李真富[2] 王群书[1] 霍裕昆[3] 马彦良[2] 张前美[2] 张国光[2] 金玉仁[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]西北核技术研究所,西安710024 [3]复旦大学现代物理研究所,上海200433

出　　处：《物理学报》2005年第10期4643-4647,共5页Acta Physica Sinica

摘　　要：研制了狭缝_外延式高灵敏大面积PIN裂变中子探测系统.其对14MeV,2·5MeV中子灵敏度可达10-16C·cm2,比原有典型的脉冲裂变中子探测系统高4个量级.采用外延式铅狭缝准直结构,研制灵敏区尺寸为60mm,厚度为200μm—300μm的大面积PIN半导体探测器、以Be膜为衬底,有效直径为60的235U裂变靶,解决了该探测器研制中的高灵敏度和n/γ分辨难题.该系统已在实践中获得成功应用.A fission neutron detector system with frontward-extended lead slot collimator has been developed and tested. By designing the slot collimator and developing large area PIN detectors as well as large area fissionable target with thin Be backing, this detector system can reach high neutron sensitivities up to 10^16C·cm^2 , which is about 4-5 orders of magnitude higher than that of existing fission detectors, and high n/γ discrimination ratio up to 30.

关 键 词：裂变中子探测系统 大面积PIN探测器 大面积裂变靶 高灵敏探测系统 探测系统 裂变中子 高灵敏度 狭缝式 半导体探测器 中子灵敏度 

分 类 号：TL816.3[核科学技术—核技术及应用] TU998.12[建筑科学—市政工程]