光电倍增管中子直照灵敏度响应

张忠兵; 马彦良; 欧阳晓平; 张国光; 张显鹏; 张建福; 张小东

强激光与粒子束, 2005, 17 (9): 1427, 网络出版: 2021-01-27

光电倍增管中子直照灵敏度响应

Energy response of photomultiplier tubes to neutron irradiation

论文大纲

张忠兵 ¹马彦良 ¹欧阳晓平 ¹张国光 ¹张显鹏 ¹张建福 ²张小东 ¹

作者单位

¹ 西北核技术研究所,陕西,西安,710024

² 西北核技术?芯克?陕西,西安,710024

灵敏度能谱响应光电倍增管脉冲中子测量 Sensitivity Response of energy Photomultiplier tube Pulse neutron measurement

摘要

光电倍增管的中子直照响应对脉冲中子探测器的设计和实际应用具有重要影响.分析了中子束直接照射光电倍增管产生直照响应的过程和机理.中子与光电倍增管入射窗硼硅玻璃中的硼和硅发生(n,α)和(n,p)反应,导致窗玻璃产生荧光,从而使光阴极发射光电子.在5SDH-2小串列加速器上,选用9815B和9850B两种光电倍增管进行实验,得到了光电倍增管的中子直照灵敏度能谱响应曲线.结果表明:中子能量由低到高变化时,光电倍增管的中子直照灵敏度也随之增大;两种光电倍增管的中子直照灵敏度比值为1.9×10²～2.74×10²,该值与其相应的增益比量级一致.

Abstract

The photomultiplier tube(PMT) responding to direct neutron irradiation has an extreme effect on the scintillation detector design and its practical applications.The response mechanism of a photomultiplier tube interacting with an accelerator neutron source was investigated.¹⁰B(n,α),²⁸Si(n,α) and ²⁸Si(n,p) reactions in borosilicate glass of the end window lead to fluorescence yield,and then the fluorescence was converted into electrons by the photocathode.Experiments were carried out with EMI photomultiplier tubes(9815B and 9850B) at 5SDH-2 accelerator and the responses to neutrons with neutron energy ranging between 0.5 MeV and 5 MeV were obtained.The results show that the spectral sensitivities increase with the incident neutron energy.The sensitivity ratio of 9815B to 9850B is about 10², which is in good agreement with the gain ratio between 9815B and 9850B.

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张忠兵, 马彦良, 欧阳晓平, 张国光, 张显鹏, 张建福, 张小东. 光电倍增管中子直照灵敏度响应[J]. 强激光与粒子束, 2005, 17(9): 1427. ZHANG Zhong-bing, MA Yan-liang, OUYANG Xiao-ping, ZHANG Guo-guang, ZHANG Xian-peng, ZHANG Jian-fu, ZHANG Xiao-dong. Energy response of photomultiplier tubes to neutron irradiation[J]. High Power Laser and Particle Beams, 2005, 17(9): 1427.

光电倍增管中子直照灵敏度响应

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