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Design of the thermal neutron detection system for CJPL-Ⅱ

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【作者】 曾昭明宫辉李荐民岳骞曾志程建平

【Author】 Zhao-Ming Zeng;Hui Gong;Jian-Min Li;Qian Yue;Zhi Zeng;Jian-Ping Cheng;Department of Engineering Physics,Tsinghua University;Key Laboratory of Particle and Radiation Imaging (Ministry of Education),Tsinghua University;

【机构】 Department of Engineering Physics,Tsinghua UniversityKey Laboratory of Particle and Radiation Imaging (Ministry of Education),Tsinghua University

【摘要】 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.

【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.

【基金】 Supported by National Natural Science Foundation of China(11475094)
  • 【文献出处】 Chinese Physics C ,中国物理C , 编辑部邮箱 ,2017年05期
  • 【分类号】O571.5
  • 【被引频次】1
  • 【下载频次】36
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