一套反宇宙射线HPGe γ谱仪系统的建立

朱宇琛; 李奇; 樊元庆; 赵允刚; 王世联; 张新军; 贾怀茂; 张瑞芹; 李芮莹; 周剑良

doi:10.7538/yzk.2022.youxian.0243

一套反宇宙射线HPGe γ谱仪系统的建立

南华大学核科学技术学院,湖南衡阳421001
禁核试北京国家数据中心和北京放射性核素实验室,北京100085

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- 刊出日期: 2023-03-19

Establishment of Anti-cosmic Ray HPGe Gamma Spectrometer

School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
CTBT Beijing National Data Centre and Beijing Radionuclide Laboratory, Beijing 100085, China

摘要

摘要: 放射性核素监测是全面禁止核试验条约（CTBT）国际监测系统（IMS）4种监测手段之一。针对放射性核素样品活度低的特点，研制了一套反宇宙射线HPGe γ谱仪系统。相对于原始的γ能谱，在15~2 700 keV能量范围内，反符合方法使全谱积分本底降低为原始谱的1/8，提高了对放射性核素的监测灵敏度。使用该系统对气溶胶样品测量7 d，¹⁴⁰Ba的最小可探测活度为10 mBq，达到了全面禁止核试验条约对核素实验室核准认证的技术要求。这不仅在CTBT放射性核素核查工作中具有重要意义，在辐射环境监测中也具有重要的应用前景。
- 放射性核素核查 ,
- 最小可探测活度 ,
- 反宇宙射线γ谱仪 ,
- 低本底
Abstract: Radionuclide verification is one of the four monitoring technologies used in International Monitoring System of Comprehensive Nuclear-Test-Ban Treaty (CTBT). The activity of radionuclides concerned by CTBT generally performs at the low-level. An anti-cosmic ray γ spectrometer system with a HPGe detector was developed by using a combination of active and passive shielding techniques in order to improve the detection sensitivity and reduce the affections of background. By adjusting the system with a delay time and testing anti-coincidence count loss correction, compared with the original γ spectrum, the integral background in the energy range of 15-2 700 keV is reduced by a factor of 8. The detection sensitivity is greatly improved by using the anti-coincidence method. For ¹⁴⁰Ba, the minimum detectable activity (MDA) is 10 mBq by using the anti-cosmic ray γ spectrometer for 7 d measurement, which meets the technical requirements for certification of nuclide laboratory under the CTBT. It is not only of great significance for CTBT radionuclide verification, but also important for radiation environment monitoring.
- radionuclide verification ,
- minimum detectable activity ,
- anti-cosmic ray γ spectrometer ,
- low background

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一套反宇宙射线HPGe γ谱仪系统的建立

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Establishment of Anti-cosmic Ray HPGe Gamma Spectrometer

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