Analysis of three digital n/gamma discrimination algorithms for liquid scintillation neutron spectrometry

作者：Chen Xiaohui^*; Liu Rong; Lu Xinxin; Zhu Tonghua

来源：Radiation Measurements, 2013, 49: 13-18.

DOI：10.1016/j.radmeas.2012.12.010

• Mixed radiation field
• Digital n/gamma discrimination
• Digital filter
• Pile-up event
• Liquid scintillation neutron spectrometry

In mixed neutron/gamma radiation fields, particle identification based on different filter algorithms and radiation intensities is an important issue for liquid scintillation neutron spectrometry. We have compared the performance of three algorithms for digital neutron/gamma discrimination in a deuterated liquid scintillator. The effects of both digital filters and simulated pile-up events on the performance of these techniques were investigated. The discrimination methods utilized are the digital charge comparison (CC) method, simplified digital charge collection (SDCC) method and pulse gradient analysis (PGA) method. The results show that the SDCC and the CC methods are preferred choices when applied in low count-rates fields, whereas PGA method with a seven-point average running filter is favorable when pile-up signals constitute a large fraction of the detected events. All these discrimination approaches are potentially suitable for developing a compact digital neutron spectrometer in mixed neutron/gamma radiation fields for use in various applications.

• 出版日期2013-2
• 单位中国工程物理研究院; 中国工程物理研究院核物理与化学研究所