Study of Material used in Liquid Scintillator Detector with Low Background

LI Xueyang; DU Qiang; LIU Shukui; LIN Xingde; XING Haoyang; TANG Changjian; ZHU Jingjun

doi:10.11804/NuclPhysRev.34.03.604

In order to measure the flux and spectrum of neutron background which is extremely low in China JinPing underground Laboratory (CJPL), liquid scintillator detector with large scale used to detect fast neutron need to be fabricated. Surrounding materials used in detector require the excellent performance, such as low radioactivity as well as stable chemical properties, which do not react with liquid scintillator, so as to avoid affecting the performance of detector. Polytetrafluoroethylene(PTFE), highly purified no-oxygen copper, fluororubber and perfluoroelastomer had been put in a small detector and soaked for a long time. The change of absorption spectrum and light yield along with time as well as the performance of n-γ discrimination after soaked were tested. The results show that PTFE and Perfluoroelastomer are compatible with liquid scintillator, which offers a reference for the selection of material used in container and seal of liquid scintillator detector used to detect fast neutron.

Study of Material used in Liquid Scintillator Detector with Low Background

1. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610065, China;

2. School of Physical Science and Technology, Sichuan University, Chengdu 610065, China;

3. Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Funds: National Natural Science Foundation of China(11055002, 11275134, 11475117); Key Laboratory of Particle and Radiation Imaging of Ministry of Education Open Foundation of Tsinghua University(20151202)

Corresponding author: 10.11804/NuclPhysRev.34.03.604

Received Date: 2016-12-01

Rev Recd Date: 2017-03-20

Publish Date: 2017-07-18

Key words:

Abstract: In order to measure the flux and spectrum of neutron background which is extremely low in China JinPing underground Laboratory (CJPL), liquid scintillator detector with large scale used to detect fast neutron need to be fabricated. Surrounding materials used in detector require the excellent performance, such as low radioactivity as well as stable chemical properties, which do not react with liquid scintillator, so as to avoid affecting the performance of detector. Polytetrafluoroethylene(PTFE), highly purified no-oxygen copper, fluororubber and perfluoroelastomer had been put in a small detector and soaked for a long time. The change of absorption spectrum and light yield along with time as well as the performance of n-γ discrimination after soaked were tested. The results show that PTFE and Perfluoroelastomer are compatible with liquid scintillator, which offers a reference for the selection of material used in container and seal of liquid scintillator detector used to detect fast neutron.

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Reference (17)

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Study of Material used in Liquid Scintillator Detector with Low Background

doi: 10.11804/NuclPhysRev.34.03.604

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