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利用双端信号输出的塑料闪烁体与灵敏度高、时间响应快的硅光电倍增管构成塑料闪烁体探测器探头,并与后端的数字化转换器等电子学系统搭建成塑料闪烁体探测器系统。为了研究不同数据处理方法对真事件探测效率和能量分辨率的优化,分别使用标准γ源60Co和137Cs对塑料闪烁体探测器系统进行测试。研究了关联事件的符合时间窗对探测器真事件探测效率的影响,分析了波形的积分长度与脉冲信号甄别(Pulse Shape Discrimination,PSD)开窗法对能谱能量分辨率的改进。结果表明,在关联事件的符合时间窗为15 ns时,真事件探测效率最佳,当波形积分长度为80 ns时,通过PSD开窗后能量分辨率由原来的53.38%优化为42.21%。
The plastic scintillator with double-ended signal output and the high sensitivity and fast time-response silicon photomultiplier tube constitute the plastic scintillator detector probe, and the back-end digital converter and other electronic systems are built into a plastic scintillator detector system. In order to study the optimization of probing efficiency and energy resolution of real events by different data processing methods, plastic scintillator detector systems were tested using standard γ sources 60Co and 137Cs respectively. The effect of coincidence time window on the detection efficiency of the detector was studied. The integral length of the waveform and the improvement of the energy resolution of the energy spectrum were analyzed by Pulse Shape Discrimination (PSD) window-opening method. The results show that the true event detection efficiency is the best when the coincident time window is 15 ns. When the integral waveform length is 80 ns, the energy resolution is optimized from 53.38% to 42.21% after the window is opened by PSD.