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| Design and Establishment of Anti-cosmic Ray Low Background Gamma Spectrometer System |
| ZHANG Zhen-zhen1,FAN Zi-hao1,2,ZHOU Qian-qian1,LIANG Jun-cheng1,ZHANG Ming1 |
1. National Institute of Metrology, Beijing 100029, China
2. China Institute of Atomic Energy, Beijing 102413, China |
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Abstract Based on the study of background and shielding method in gamma spectrometer, an anti-cosmic low-background γ-ray spectrometer system which the integrated background is up to 1.1×10-1s-1/100cm3Ge in the energy region between 100keV and 2500keV was built. Apply this device to measure the standard samples of 75mm×70mm soil substrate and 75mm×35mm biological ash substrate. The minimum detectable activity of137 cs in soil samples was 0.089Bq; the minimum detectable activity of137 Cs and134 Cs in biological gray samples were 0.068Bq and 0.098Bq.
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［1］范梓浩. 反宇宙射线超低本底伽马谱仪的研究设计［D］. 南昌: 东华理工大学, 2018.
［2］Arnold J R, Libby W F. Age Determinations by Radiocarbon Content: Checks with Samples of Known Age［J］. Science, 1949, 110(2869): 678-680.
［3］Hutchinson J M R, Mann W B, Perkins R W. Low-level radioactivity measurements［J］. Nuclear Instruments & Methods, 1973, 112(1-2): 305-318.
［4］Heusser G, Weber M, Hakenmüller J, et al. GIOVE: a new detector setup for high sensitivity germanium spectroscopy at shallow depth［J］. The European Physical Journal C, 2015, 75(11): 1-16.
［5］Heusser G, Weber M, Denz T, et al. GIOVE, a shallow laboratory Ge-spectrometer with 100 μBq/kg sensitivity［C］// AIP Conference Proceedings. 2013: 12-15.
［6］刁立军, 侯铁栋, 姚顺和, 等. 新建反宇宙射线低本底γ谱仪及其应用［C］//全国核电子学与核探测技术学术年会. 2010: 526-530.
［7］Laurec J, Blanchard X, Pointurier F, et al. A new low background gamma spectrometer equipped with an anti-cosmic device［J］. Nuclear Instruments and Methods in Physics Research, 1996, 369(2-3): 566-571.
［8］Berger M J, Hubbell J H, et al. XCOM: Photon Cross Section Database (version 1.5)［EB/OL］. http://physics.nist.gov/xcom
［9］Benettoni M, Bonomi G, Calvini P, et al. Muon radiography with the CMS Muon Barrel chambers［C］// IEEE. Nuclear Science Symposium Conference Record. 2008: 1021-1025.
［10］侯铁栋. 反宇宙射线低本底γ谱仪本底来源及降低方法［D］. 南宁: 广西大学, 2010.
［11］Annunziata M. Handbook of Radioactivity Anlysis Second Edition［M］. Elsevier/Academic Press, 2003. |
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