A scintillation detector signal processing technique with active pileup prevention for extending scintillation count rates
A scintillation detector signal processing technique with active pileup prevention for extending scintillation count rates
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DOI：
10.1109/23.682647
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发表时间：
1998-06-01
影响因子：
1.8
通讯作者：
Li, H
中科院分区：
文献类型：
--
作者：
Wong, WH;Li, H
提出了一种处理闪烁探测器信号的新方法，用于高计数率的情况下，多事件堆积是常态。该方法旨在从多事件堆中对每个碰撞事件进行分类和恢复，同时最大限度地收集每个事件的闪烁信号，以达到确定事件能量的最佳精度。对于每个检测到的事件，该方法会取消先前事件的残余信号，并排除后续事件的信号堆积。使用这种技术，可以恢复堆积事件，并且可以在多次堆积的情况下最佳地测量每个恢复事件的能量。一个原型电路表明，与标准脉冲整形方法相比，最大计数率提高了IO倍以上，而在正常计数率下，能量分辨率与脉冲整形（或固定积分）方法一样好。对于NaI(T1)，在2x10(6)个事件/秒时，由于事件从堆积中恢复，获得的真实计数是延迟线裁剪方法（通常用于快速处理设计）的3倍。已经研究了高达3.5x10(6)事件/秒的脉冲高度光谱。
A new method for processing signals from scintillation detectors is proposed for very high count-rate situations where multiple-event pileups are the norm. This method is designed to sort out and recover every impinging event from multiple-event pileups while maximizing the collection of scintillation signal for every event to achieve optimal accuracy in determining the energy of the event. For every detected event, this method cancels the remnant signals from previous events, and excludes the pileup of signals from following events. With this technique, pileup events can be recovered and the energy of every recovered event can be optimally measured despite multiple pileups. A prototype circuit demonstrated that the maximum count rates have been increased by more than IO times, comparing to the standard pulse-shaping method, while the energy resolution is as good as that of the pulse shaping (or the fixed integration) method at normal count rates. At 2x10(6) events/sec for NaI(T1), the true counts acquired are 3 times more than the delay-line clipping method (commonly used in fast processing designs) due to events recovered from pileups. Pulse-height spectra up to 3.5x10(6) events/sec have been studied.