中子通量测量的质子反冲望远镜  

The Proton Recoil Telescope of Measuring Neutron Flux

作　　者：陈静[1] 郑普[1] 陈渊[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《核电子学与探测技术》2011年第9期1018-1021,共4页Nuclear Electronics & Detection Technology

摘　　要：研制了用于测量D-T中子通量的质子反冲闪烁望远镜,望远镜由二个对带电粒子响应的半导体探测器(ΔE)和一个CsI(Tl)闪烁探测器(E)组成。利用脉冲形状甄别技术抑制CsI闪烁探测器的γ射线本底,ΔE探测器的高偏压对提高信噪比是重要的。二个ΔE探测器和一个E探测器实现了三重符合。在三重符合条件下,通过有、无辐射体的测量得到了净的反冲质子脉冲幅度分布。CH2辐射体60mg.cm-2并距中子源30 cm时,望远镜效率为1.97×10-7。A proton recoil scintillation telescope has been made,which is used to measure neutron flux from D-T reaction.The telescope is consisted of two semiconductor detectors（ΔE） and a CsI（Tl） scintillation detector（E）.Pulse-shape discrimination technology was used to eliminate（-ray background from CsI scintillation detector.The higher bias voltage of ΔE semiconductor detector favors improving single noise ratio.The triple coincidences are consisted of two ΔE detectors and E detector.The net proton recoil pulse height distribution is deduced from results measured with and without radiator by triple coincidences.When the distance from the radiator to neutron source is 30 cm,and the radiator thickness of 60mg/cm^2,the telescope detection efficiency is 1.97×10^-7.

关 键 词：辐射体 ΔE半导体探测器 三重符合 质子反冲望远镜 

分 类 号：O571[理学—粒子物理与原子核物理]