基于波长位移光纤的232Th+ZnS（Ag）闪烁体中子探测器  

Scintillation neutron detectors based on a wavelength-shifting optical fiber using 232Th+ZnS（Ag）

作　　者：白召乐 周琦[3] 杨楠 刘锋[3] 杨中建[4] 陈宝维[4] 王建龙[1] BAI Zhaole;ZHOU Qi;YANG Nan;LIU Feng;YANG Zhongjian;CHEN Baowei;WANG Jianlong(Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;Environmental Protection Department of Tibet Autonomous Region, Lasa 850000, China;Division of Reactor Engineering Technology Research, China Institute of Atomic Energy, Beijing 102413, China 4. Department of Health Physics, China Institute for Radiation Protection, Taiynan 030006, China)

机构地区：[1]清华大学核能与新能源技术研究院、先进核能技术协同创新中心,北京100084 [2]西藏自治区环境保护厅,拉萨850000 [3]中国原子能科学研究院反应堆工程技术研究部,北京102413 [4]中国辐射防护研究院保健物理研究所,太原030006

出　　处：《清华大学学报（自然科学版）》2018年第6期558-562,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(11775193)

摘　　要：闪烁体光纤探测器是近年来发展起来的一种可用于中子测量的新型探测器,为了提高闪烁体光纤探测器的中子探测效率,该文以-（232） Th＋ZnS（Ag）为探测器材料,利用波长位移光纤代替普通光纤收集和传输信号,并对改进的探测器的探测效率进行了理论分析和实验验证。研究结果表明：波长位移光纤探测器的计数率约为普通光纤的1.7倍。该探测器应用于加速器驱动次临界系统的中子探测,获得了次临界反应堆实验装置中子的分布变化规律,与计算结果较为一致。Optical fiber scintillator neutron detectors have developed rapidly in recent years because these detectors are small （so that they can be extended into narrow spaces） and give real-time measurements. However, the probe detection efficiency is low due to the small size of the probe＇s effective detection material. This study presents a theoretical and experimental study of a 232Th ＋ ZnS（Ag） neutron detector with a wavelength-shifting fiber was used to improve the detection efficiency. This detector was used to measure the neutron distribution of the ADS sub-critical experimental assembly with the measurement results beingconsistent with the theoretical model which indicates that the high detection efficiency is very good and the wavelength shifting fiber neutron detector is accurate.

关 键 词：波长位移光纤 闪烁体中子探测器 探测效率 

分 类 号：TL816.3[核科学技术—核技术及应用]