介质型脉冲高能中子探测器  

Medium-Type Pulsed Fast-Neutron Detector

作　　者：欧阳晓平[1] 李真富[2] 霍裕昆[1] 张忠兵[2] 沈汉良[3] 张前美[2] 

机构地区：[1]复旦大学现代物理研究所,上海200433 [2]西北核技术研究所,西安710024 [3]中国科学院近代物理研究所,兰州730000

出　　处：《高能物理与核物理》2001年第11期1100-1105,共6页High Energy Physics and Nuclear Physics

摘　　要：首次报道一种基于反冲质子法和高速带电粒子在物质表面引起二次电子发射的高能中子探测方法 ,研制成功的新一代强流脉冲高能中子探测器 ,即介质型脉冲高能中子探测器 .与传统的强流脉冲中子探测器相比 ,该探测器对中子的探测及信号的传输过程是在介质中完成的 ,因而不需要真空和高压也可以正常工作 ,并具有多项优异的物理性能 .该探测器的输出信号来自于高能中子在聚乙烯转换靶产生的高能反冲质子和这些质子穿越电荷收集极表面时产生的部分二次电子 .选择适当的卡阈吸收片和电荷收集极材料 。In this paper a newly developed medium type pulsed fast neutron detector is proposed. The detector consists of front insulator,n p converter,absorber,collector and rear insulator. The detection principle is based on the output signal from both recoil protons of the n p converter and secondary electrons induced by the recoil protons passing the interface between the absorber and the collector. Because of its detection of fast neutrons in the medium,unlike many trandifional fast neutron detectors which work in the vacuum environment,this detector has obvious advantages. It does not need vacuum environment and high voltage power supply. This makes it to be used easily. By choosing teflon as the absorber and by choosing graphite as the charge collector,the contribution of the secondary electrons to the output signal can be determined experimentally.

关 键 词：反冲质子 二次电子发射 高能中子探测器 强流脉冲 时间响应 

分 类 号：O572.2[理学—粒子物理与原子核物理]