Digital pulse shape discrimination methods for n-γ separation in an EJ-301 liquid scintillation detector

WAN Bo; ZHANG Xue-Ying; CHEN Liang; GE Hong-Lin; MA Fei; ZHANG Hong-Bin; JU Yong-Qin; ZHANG Yan-Bin; LI Yan-Yan; XU Xiao-Wei

doi:10.1088/1674-1137/39/11/116201

Chinese Physics C> 2015, Vol. 39> Issue(11) : 116201 DOI: 10.1088/1674-1137/39/11/116201

Digital pulse shape discrimination methods for n-γ separation in an EJ-301 liquid scintillation detector

WAN Bo ^1,2 ,
ZHANG Xue-Ying ^1,, ,
CHEN Liang ¹ ,
GE Hong-Lin ¹ ,
MA Fei ¹ ,
ZHANG Hong-Bin ¹ ,
JU Yong-Qin ¹ ,
ZHANG Yan-Bin ¹ ,
LI Yan-Yan ^1,2 ,
XU Xiao-Wei ^1,2

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Abstract：
A digital pulse shape discrimination system based on a programmable module NI-5772 has been established and tested with an EJ-301 liquid scintillation detector. The module was operated by running programs developed in LabVIEW, with a sampling frequency up to 1.6 GS/s. Standard gamma sources ²²Na, ¹³⁷Cs and ⁶⁰Co were used to calibrate the EJ-301 liquid scintillation detector, and the gamma response function was obtained. Digital algorithms for the charge comparison method and zero-crossing method have been developed. The experimental results show that both digital signal processing (DSP) algorithms can discriminate neutrons from γ-rays. Moreover, the zero-crossing method shows better n-γ discrimination at 80 keVee and lower, whereas the charge comparison method gives better results at higher thresholds. In addition, the figure-of-merit (FOM) for detectors of two different dimensions were extracted at 9 energy thresholds, and it was found that the smaller detector presented better n-γ separation for fission neutrons.
- EJ-301 liquid scintillation detector ,
- digital signal processing ,
- charge comparison method ,
- zero-crossing method

References

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WAN Bo, ZHANG Xue-Ying, CHEN Liang, GE Hong-Lin, MA Fei, ZHANG Hong-Bin, JU Yong-Qin, ZHANG Yan-Bin, LI Yan-Yan and XU Xiao-Wei. Digital pulse shape discrimination methods for n-γ separation in an EJ-301 liquid scintillation detector[J]. Chinese Physics C, 2015, 39(11): 116201. doi: 10.1088/1674-1137/39/11/116201

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Received: 2015-02-06

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Supported by National Natural Science Foundation of China (91226107, 11305229) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA03030300)

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沈阳化工大学材料科学与工程学院沈阳 110142

Digital pulse shape discrimination methods for n-γ separation in an EJ-301 liquid scintillation detector

Corresponding author: ZHANG Xue-Ying,

Received Date: 2015-02-06
Available Online: 2015-11-20

Fund Project: Supported by National Natural Science Foundation of China (91226107, 11305229) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA03030300)

Abstract: A digital pulse shape discrimination system based on a programmable module NI-5772 has been established and tested with an EJ-301 liquid scintillation detector. The module was operated by running programs developed in LabVIEW, with a sampling frequency up to 1.6 GS/s. Standard gamma sources ²²Na, ¹³⁷Cs and ⁶⁰Co were used to calibrate the EJ-301 liquid scintillation detector, and the gamma response function was obtained. Digital algorithms for the charge comparison method and zero-crossing method have been developed. The experimental results show that both digital signal processing (DSP) algorithms can discriminate neutrons from γ-rays. Moreover, the zero-crossing method shows better n-γ discrimination at 80 keVee and lower, whereas the charge comparison method gives better results at higher thresholds. In addition, the figure-of-merit (FOM) for detectors of two different dimensions were extracted at 9 energy thresholds, and it was found that the smaller detector presented better n-γ separation for fission neutrons.