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《中国物理C》(英文)编辑部
2024年10月30日

Measurement of intrinsic radioactive backgrounds from the 137Cs and U/Th chains in CsI(Tl) crystals

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LIU Shu-Kui, YUE Qian, LIN Shin-Ted, LI Yuan-Jing, TANG Chang-Jian, WONG Tsz-King, XING Hao-Yang, YANG Chao-Wen, ZHAO Wei and ZHU Jing-Jun. Measurement of intrinsic radioactive backgrounds from the 137Cs and U/Th chains in CsI(Tl) crystals[J]. Chinese Physics C, 2015, 39(4): 046002. doi: 10.1088/1674-1137/39/4/046002
LIU Shu-Kui, YUE Qian, LIN Shin-Ted, LI Yuan-Jing, TANG Chang-Jian, WONG Tsz-King, XING Hao-Yang, YANG Chao-Wen, ZHAO Wei and ZHU Jing-Jun. Measurement of intrinsic radioactive backgrounds from the 137Cs and U/Th chains in CsI(Tl) crystals[J]. Chinese Physics C, 2015, 39(4): 046002.  doi: 10.1088/1674-1137/39/4/046002 shu
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Received: 2014-08-04
Revised: 2014-10-22
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Measurement of intrinsic radioactive backgrounds from the 137Cs and U/Th chains in CsI(Tl) crystals

    Corresponding author: YUE Qian,
    Corresponding author: LIN Shin-Ted,

Abstract: The inorganic CsI(Tl) crystal scintillator is a candidate anti-compton detector for the China Dark matter Experiment. Studying the intrinsic radiopurity of the CsI(Tl) crystal is an issue of major importance. The timing, energy and spatial correlations, as well as the capability of pulse shape discrimination provide powerful methods for the measurement of intrinsic radiopurities. The experimental design, detector performance and event-selection algorithms are described. A total of 359×3 kg-days data from three prototypes of CsI(Tl) crystals were taken at China Jinping Underground Laboratory (CJPL), which offers a good shielding environment. The contamination levels of internal isotopes from 137Cs, 232Th and 238U series, as well as the upper bounds of 235U series are reported. Identification of the whole α peaks from U/Th decay chains and derivation of those corresponding quenching factors are achieved.

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