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arXiv · 1502.01807

Study of digital pulse shape discrimination method for n-γ separation of EJ-301 liquid scintillation detector

Bo Wan·Xueying Zhang·Liang Chen·Honglin Ge·Fei Ma·Hongbin Zhang·Yongqin Ju·Yanbin Zhang·Yanyan Li·Xiaowei Xu
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Abstract

A digital pulse shape discrimination system based on a programmable module NI-5772 has been established and tested with EJ-301 liquid scintillation detector. The module was operated by means of running programs developed in LabVIEW with the sampling frequency up to 1.6GS/s. Standard gamma sources 22Na, 137Cs and 60Co were used to calibrate the EJ-301 liquid scintillation detector, and the gamma response function has been obtained. Digital algorithms for charge comparison method and zero-crossing method have been developed. The experimental results showed that both digital signal processing (DSP) algorithms could discriminate neutrons from gamma-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) of two different dimension detectors were extracted at 9 energy thresholds, and it was found that the smaller one presented a better n-γ separation property for fission neutrons.

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Bo Wan, Xueying Zhang, Liang Chen, Honglin Ge, Fei Ma, Hongbin Zhang, Yongqin Ju, Yanbin Zhang, Yanyan Li, Xiaowei Xu. 2015-02-06. Study of digital pulse shape discrimination method for n-γ separation of EJ-301 liquid scintillation detector. https://doi.org/10.1088/1674-1137%2F39%2F11%2F116201

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