Chinese Physics C > 2015, Vol. 39 > Issue(4): 046002 DOI: 10.1088/1674-1137/39/4/046002

Measurement of intrinsic radioactive backgrounds from the¹³⁷Cs and U/Th chains in CsI(Tl) crystals

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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.

References

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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

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Received: 2014-08-04
Revised: 2014-10-22

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of intrinsic radioactive backgrounds from the¹³⁷Cs and U/Th chains in CsI(Tl) crystals

Corresponding author:YUE Qian,

Corresponding author:LIN Shin-Ted,

Received Date:2014-08-04

Accepted Date:2014-10-22

Available Online:2015-04-05

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 from¹³⁷Cs,²³²Th and²³⁸U series, as well as the upper bounds of²³⁵U 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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Measurement of intrinsic radioactive backgrounds from the¹³⁷Cs and U/Th chains in CsI(Tl) crystals

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