Design of the thermal neutron detection system for CJPL-II

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Zhao-Ming Zeng, Hui Gong, Jian-Min Li, Qian Yue, Zhi Zeng and Jian-Ping Cheng. Design of the thermal neutron detection system for CJPL-II[J]. Chinese Physics C, 2017, 41(5): 056002. doi: 10.1088/1674-1137/41/5/056002
Zhao-Ming Zeng, Hui Gong, Jian-Min Li, Qian Yue, Zhi Zeng and Jian-Ping Cheng. Design of the thermal neutron detection system for CJPL-II[J]. Chinese Physics C, 2017, 41(5): 056002.  doi: 10.1088/1674-1137/41/5/056002 shu
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Received: 2016-11-20
Revised: 2016-12-29
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    Supported by National Natural Science Foundation of China (11475094)

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Design of the thermal neutron detection system for CJPL-II

    Corresponding author: Zhao-Ming Zeng,
    Corresponding author: Hui Gong,
    Corresponding author: Jian-Min Li,
    Corresponding author: Qian Yue,
    Corresponding author: Zhi Zeng,
    Corresponding author: Jian-Ping Cheng,
  • 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 2. Key Laboratory of Particle and Radiation Imaging (Ministry of Education), Tsinghua University, Beijing 100084, China
Fund Project:  Supported by National Natural Science Foundation of China (11475094)

Abstract: A low background thermal neutron flux detection system has been designed to measure the ambient thermal neutron flux of the second phase of the China Jinping Underground Laboratory (CJPL-II), right after completion of the rock bolting work. A 3He proportional counter tube combined with an identical 4He proportional counter tube was employed as the thermal neutron detector, which has been optimised in energy resolution, wall effect and radioactivity of construction materials for low background performance. The readout electronics were specially designed for long-term stable operation and easy maintenance in an underground laboratory under construction. The system was installed in Lab Hall No. 3 of CJPL-II and accumulated data for about 80 days. The ambient thermal neutron flux was determined under the assumption that the neutron field is fully thermalized, uniform and isotropic at the measurement position.

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