液闪探测器的几种n/γ甄别方法研究

Investigation on n/γ Discrimination Methods for Liquid Scintillator Detector

摘要: 利用液闪探测器研究了几种数字化波形甄别方法的n/γ甄别能力。以Am-Be源作为混合场源，用示波器对EJ-301和BC501A两种液闪探测器信号进行数字化采集，分别用上升时间法、电荷比较法、脉冲梯度分析和频率梯度分析等数字化波形甄别方法对采集的信号进行了n/γ离线甄别分析，比较了4种方法的甄别效果，并用MPD-4甄别单元从实验上验证了各方法的可靠性。结果表明：对于液闪探测器，4种数字化方法具有较好的甄别一致性和准确性，上升时间法的甄别效果最好，是实时甄别系统甄别算法的理想选择。

Abstract: To obtain the n/γ discrimination ability of different digital pulse shape discrimination methods, four methods (rising time method, charge comparison method, pulse gradient analysis and frequency gradient analysis) in americium-beryllium mixed radiation fields were demonstrated. The signals from EJ-301 and BC501A scintillator detectors were digitized using oscilloscope. A comparison was taken among the four discrimination methods. The discrimination results of the four methods in liquid scintillator detectors show that the rising time method is the best and it provides a good choice in real-time n/γ discrimination system.