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清华大学学报(自然科学版)  2018, Vol. 58 Issue (6): 558-562    DOI: 10.16511/j.cnki.qhdxxb.2018.26.028
  核能与新能源工程 本期目录 | 过刊浏览 | 高级检索 |
基于波长位移光纤的232Th+ZnS(Ag)闪烁体中子探测器
白召乐1,2, 周琦3, 杨楠4, 刘锋3, 杨中建4, 陈宝维4, 王建龙1
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
Scintillation neutron detectors based on a wavelength-shifting optical fiber using 232Th+ZnS(Ag)
BAI Zhaole1,2, ZHOU Qi3, YANG Nan4, LIU Feng3, YANG Zhongjian4, CHEN Baowei4, WANG Jianlong1
1. Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
2. Environmental Protection Department of Tibet Autonomous Region, Lasa 850000, China;
3. Division of Reactor Engineering Technology Research, China Institute of Atomic Energy, Beijing 102413, China;
4. Department of Health Physics, China Institute for Radiation Protection, Taiyuan 030006, China
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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232Th+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。
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白召乐
周琦
杨楠
刘锋
杨中建
陈宝维
王建龙
关键词 波长位移光纤闪烁体中子探测器探测效率    
Abstract: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 being consistent with the theoretical model which indicates that the high detection efficiency is very good and the wavelength-shifting fiber neutron detector is accurate.
Key wordswavelength-shifting fiber    scintillator neutron detector    detection efficiency
收稿日期: 2018-01-07      出版日期: 2018-06-21
基金资助:国家自然科学基金资助项目(11775193)
通讯作者: 王建龙,教授,E-mail:wangjl@tsinghua.edu.cn     E-mail: wangjl@tsinghua.edu.cn
引用本文:   
白召乐, 周琦, 杨楠, 刘锋, 杨中建, 陈宝维, 王建龙. 基于波长位移光纤的232Th+ZnS(Ag)闪烁体中子探测器[J]. 清华大学学报(自然科学版), 2018, 58(6): 558-562.
BAI Zhaole, ZHOU Qi, YANG Nan, LIU Feng, YANG Zhongjian, CHEN Baowei, WANG Jianlong. Scintillation neutron detectors based on a wavelength-shifting optical fiber using 232Th+ZnS(Ag). Journal of Tsinghua University(Science and Technology), 2018, 58(6): 558-562.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2018.26.028  或          http://jst.tsinghuajournals.com/CN/Y2018/V58/I6/558
  图1 光在一个介质分界面上的反射与折射
  图2 光在2个介质分界面上的反射与折射
  图3 入射光在波长位移光纤中传输过程
  表1 不同探测器的计数率
  图4 启明星一号快中子区第五层中子能谱图
  图5 启明星一号快中子区第五层快中子分布图
  表2 启明星一号内快中子区第五层不同 位置处探测器测量的计数率(s-1)
  图6 波长位移光纤与普通光纤探测器 在启明星一号内的测量结果
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