基于半经验法多球中子谱仪校准

辐射防护 ›› 2024, Vol. 44 ›› Issue (2): 120-125.

基于半经验法多球中子谱仪校准

孙博文^1,2, 曾志^1,2, 张辉^1,2, 马豪^1,2, 李君利^1,2

1.清华大学工程物理系,北京 100084;
2.清华大学粒子技术与辐射成像教育部重点实验室,北京 100084

收稿日期:2023-02-27 出版日期:2024-03-20 发布日期:2024-04-19
通讯作者: 曾志。E-mail:zengzhi@tsinghua.edu.cn
作者简介:孙博文(1996—),男,2017年毕业于清华大学工程物理(能源实验班)专业,现为清华大学核科学与技术专业在读硕士研究生。E-mail:sun-bw13@tsinghua.org.cn

Calibration of Bonner Sphere Spectrometer using semi-empirical method

SUN Bowen^1,2, ZENG Zhi^1,2, ZHANG Hui^1,2, MA Hao^1,2, LI Junli^1,2

1. Department of Engineering Physics,Tsinghua University,Beijing 100084;
2. Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084

Received:2023-02-27 Online:2024-03-20 Published:2024-04-19

摘要/Abstract

摘要： 基于半经验法扣除中子散射本底,提出了一种多球中子谱仪校准的新方法。首先用热中子参考辐射装置校准多球中子谱仪各中子球内He-3正比计数器的探测效率。用多球中子谱仪各中子球单独测量参考²⁴¹Am-Be中子源,结合半经验法扣除散射,给出了各中子球的注量响应。结合两者实验结果,获得²⁴¹Am-Be源能谱并给出谱仪注量响应。结果表明,校准的多球中子谱仪具备快中子区测量能力。

关键词: 多球中子谱仪, 校准, 中子能谱, 半经验法

Abstract: A new method for calibrating Bonner Sphere Spectrometer by using semi-empirical method to deduct neutron scattering background was proposed. The detection efficiency of the He-3 proportional counters in each neutron sphere of Bonner Sphere Spectrometer was calibrated by using a thermal neutron reference radiation device. The reference ²⁴¹Am-Be neutron source was measured separately by each neutron sphere of the Bonner Sphere Spectrometer, and the fluence response of each neutron sphere was given by using the semi-empirical method to deduct the scattering. Combining the results of two experiments, the energy spectrum of ²⁴¹Am-Be neutron field was obtained and the fluence calibration factor of the spectrometer was given. The results also verify the ability of calibrated Bonner Sphere Spectrometer to measure fast neutron field.

Key words: Bonner Sphere Spectrometer, calibration, neutron energy spectrum, semi-empirical method

中图分类号:

TL817

孙博文, 曾志, 张辉, 马豪, 李君利. 基于半经验法多球中子谱仪校准[J]. 辐射防护, 2024, 44(2): 120-125.

SUN Bowen, ZENG Zhi, ZHANG Hui, MA Hao, LI Junli. Calibration of Bonner Sphere Spectrometer using semi-empirical method[J]. RADIATION PROTECTION, 2024, 44(2): 120-125.

参考文献

[1] Thomas D J, Alevra A V. Bonner sphere spectrometers—A critical review[J]. Nuclear Instruments & Methods in Physics Research, 2002, 476(1-2):12-20.
[2] Howell R M, Burgett E A, Wiegel B, et al. Calibration of a Bonner sphere extension (BSE) for high-energy neutron spectrometry[J]. Radiation Measurements, 2010, 45(10):1233-1237.
[3] CAO Jing, JIANG C Y, YANG Q W, et al. Verification of a fusion neutron diagnostic Bonner sphere spectrometer on measurement of a ~(241)Am-Be neutron source[J]. Nuclear Science and Techniques, 2016,27(6):128.
[4] 孙博文, 代文翰, 张辉, 等. ²⁴¹Am-Be强中子源刻度多球中子谱仪[J]. 核电子学与探测技术,2022,42(6):1063-1067.
[5] ISO. Reference neutron radiations—Part 2 : Calibration fundamentals of radiation protection devices related to the basic quantities characterizing the radiation field: ISO 8529-2 [S].2000.
[6] 杨道广,陆双桐.球形³He正比计数管研制[J].核电子学与探测技术,2014,34(4):521-525.
[7] Tatsuhiko S, Qinghui Z. Analytical model for estimating terrestrial cosmic ray fluxes nearly anytime and anywhere in the world: Extension of PARMA/EXPACS[J]. PLoS ONE, 2015, 10(12):e0144679.
[8] ICRP. Conversion coefficients for use in radiological protection against external radiation[R]. ICRP Publication 74.Annals of the ICRP, 1997, 26.
[9] 杨竣凯, 王平全, 张辉,等. 热中子参考辐射装置参数的实验测量[J]. 核技术, 2021, 44(11):7-13.
[10] WANG X,HUI Z,ZHEN W U,et al. Development of spectrum unfolding code for multi-sphere neutron spectrometer using genetic algorithms[J]. 核技术(英文版),2014,25(0z1):36-41.
[11] 张辉, 樊成, 龚晓明. 采用放射性核素中子源的中子参考辐射装置[J]. 计量学报, 2011, 32(6):559-563.
[12] ISO. Reference neutron radiations——Part 1:Characteristics and methods of production:ISO 8529-1[S].2021.