摘要
中子探测器用于测量未知中子辐射场的中子信息时,热中子灵敏度是中子探测器的一项重要参数,需提前对其进行热中子灵敏度的检测,以保证数据的可靠性。此外热中子灵敏度也是中子探测器性能优劣的一个重要指标,指导着探测器的改进和应用。为检测某中子多芯硼管探测器样件的热中子灵敏度,提出一种在非标准中子场下测量热中子灵敏度的实验方法。该方法通过慢化同位素中子源建立含有热中子的中子场,利用活化箔法对探测器所在空间处的热中子注量率进行绝对测量,进而求得该中子探测器的热中子灵敏度。此外,对于不同几何布置下该中子多芯硼管探测器的热中子灵敏度检测结果进行实验分析,确定优选的几何布置。结果表明:该中子多芯硼管具有良好的热中子灵敏度,且测量结果与厂家在标定的结果吻合良好,验证该热中子灵敏度检测方法的可行性与准确性。此实验方法为后续开展探测器的结构设计、优化等提供便利。
Thermal neutron sensitivity is a significant parameter for neutron detectors when measuring neutron information from unknown neutron radiation fields.The thermal neutron sensitivity of the detector needs to be calibrated in advance to ensure the reliability of the data.In addition,thermal neutron sensitivity is an important indicator of the performance of neutron detectors,and is of great significance in guiding the improvement and application of detectors.In this paper,in order to measure the thermal neutron sensitivity of a sample neutron multiwire boron tube detector,an experimental method to measure the thermal neutron sensitivity under a non-standard neutron field was proposed.The method established a neutron field containing thermal neutrons by slowing down the isotopic neutron source.The method used the activation foil method to make an absolute measurement of the thermal neutron flux at the space where the detector is located.The thermal neutron sensitivity of this neutron detector was then calculated in combination with the count rate of the detector.In addition,the thermal neutron sensitivity measurement results of this neutron multiwire boron tube detector in different geometrical arrangements were experimentally analyzed,and the optimal geometrical arrangement was determined.The results showed that the neutron multiwire boron tube had good thermal neutron sensitivity,and the measurement results were in good agreement with the manufacturer's results in calibration.These results has verified the feasibility and accuracy of this thermal neutron sensitivity test method proposed.This experimental method will facilitate the subsequent structural design,optimization,etc.of the detector.
作者
赵国海
张荣华
李多宏
徐争争
陈金铸
赵冬
贾文宝
韩叶良
ZHAO Guohai;ZHANG Ronghua;LI Duohong;XU Zhengzheng;CHEN Jinzhu;ZHAO Dong;JIA Wenbao;HAN Yeliang(State Nuclear Security Technology Center,Beijing 102401,China;Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China;School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China)
出处
《世界核地质科学》
CAS
2024年第4期841-847,共7页
World Nuclear Geoscience
关键词
中子探测器
热中子灵敏度
热中子注量率
neutron detector
thermal neutron sensitivity
thermal neutron flux
