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
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.
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.
[1] 李严严, 张雪荧, 张艳斌, 等. 用于在线测量反应堆内热中子相对通量密度分布的闪烁体光纤探测器研究[J]. 原子能科学技术, 2017, 51(7):1290-1295. LI Y Y, ZHANG X Y, ZHANG Y B, et al. Study on scintillator fiber detector for online measurement of thermal neutron relative flux density distribution in reactor[J]. Atomic Energy Science and Technology, 2017, 51(7):1290-1295. (in Chinese) [2] MORI C, OSADA T, YANAGIDA K, et al. Simple and quick measurement of neutron flux distribution by using an optical fiber with scintillator[J]. Journal of Nuclear Science and Technology, 1994, 31(3):248-249. [3] MORI C, URITANI A, MIYAHARA H, et al. Measurement of neutron and γ-ray intensity distributions with an optical fiber-scintillator detector[J]. Nuclear Instruments and Methods in Physics Research Section A:Accelerators, Spectrometers, Detectors and Associated Equipment, 1999, 422(1-3):129-132. [4] YAGI T, UNESAKI H, MISAWA T, et al. Development of a small scintillation detector with an optical fiber for fast neutrons[J]. Applied Radiation and Isotopes, 2011, 69(2):539-544. [5] JANG K W, CHO D H, YOO W J, et al. Measurements of thermal neutron distribution of nuclear fuel using a plastic fiber-optic sensor[J]. Journal of Sensor Science and Technology, 2009, 18(5):402-407. [6] MATSUMOTO T, HARANO H, MASUDA A, et al. New idea of a small-sized neutron detector with a plastic fibre[J]. Radiation Protection Dosimetry, 2011, 146(1-3):92-95. [7] ITO Y, KATANO G, HARANO H, et al. Development of a tiny neutron probe with an optical fibre for BNCT[J]. Radiation Protection Dosimetry, 2004, 110(1-4):619-622. [8] YAGI T, MISAWA T, PYEON C H, et al. A small high sensitivity neutron detector using a wavelength-shifting fiber[J]. Applied Radiation and Isotopes, 2011, 69(1):176-179. [9] YAGI T, PYEON C H, MISAWA T. Application of wavelength-shifting fiber to subcriticality measurements[J]. Applied Radiation and Isotopes, 2013, 72:11-15. [10] 王玉田. 光电子学与光纤传感器技术[M]. 北京:国防工业出版社, 2003. WANG Y T. The Optoelectronics and optical fiber sensor technology[M]. Beijing:National Defense Industry Press, 2003. (in Chinese) [11] 白召乐, 周琦, 杨中建, 等. 用于反应堆内相对中子通量密度在线测量的闪烁体光纤探测系统研制[J]. 原子能科学技术, 2017, 51(9):1658-1664. BAI Z L, ZHOU Q, YANG Z J, et al. Development on scintillator fiber detect system for on-line measurement of relative neutron flux density in reactor[J]. Atomic Energy Science and Technology, 2017, 51(9):1658-1664. (in Chinese) [12] 史永谦. 核反应堆中子学实验技术[M]. 北京:中国原子能出版社, 2011.SHI Y Q. Nuclear reactor neutrons experimental technology[M]. Beijing:China Atomic Energy Publishing House, 2011. (in Chinese) [13] 史永谦, 夏普, 罗璋琳, 等. ADS次临界实验装置——启明星1#[J]. 原子能科学技术, 2005, 39(5):447-450. SHI Y Q, XIA P, LUO Z L, et al. ADS sub-critical experimental assembly——Venus 1#[J]. Atomic Energy Science and Technology, 2005, 39(5):447-450. (in Chinese) [14] WU C, TANG B, SUN Z J, et al. A study of ZnS(Ag)/6LiF with different mass ratios[J]. Radiation Measurements, 2013, 58:128-132.
2018, Vol. 58 
