High-rate dead-time corrections in a general purpose digital pulse processing system

被引:40
作者
Abbene, Leonardo [1 ]
Gerardi, Gaetano [1 ]
机构
[1] Univ Palermo, Dipartimento Fis & Chim, I-90128 Palermo, Italy
关键词
dead-time; cascade of dead-times; time interval distribution; digital pulse processing; X-RAY SPECTROSCOPY; COUNTING STATISTICS; NUCLEAR SPECTROSCOPY; DETECTORS; CDTE; PERFORMANCE; RESOLUTION; VARIANCE; COUNTERS; PROGRESS;
D O I
10.1107/S1600577515013776
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Dead-time losses are well recognized and studied drawbacks in counting and spectroscopic systems. In this work the abilities on dead-time correction of a real-time digital pulse processing (DPP) system for high-rate high-resolution radiation measurements are presented. The DPP system, through a fast and slow analysis of the output waveform from radiation detectors, is able to perform multi-parameter analysis (arrival time, pulse width, pulse height, pulse shape, etc.) at high input counting rates (ICRs), allowing accurate counting loss corrections even for variable or transient radiations. The fast analysis is used to obtain both the ICR and energy spectra with high throughput, while the slow analysis is used to obtain high-resolution energy spectra. A complete characterization of the counting capabilities, through both theoretical and experimental approaches, was performed. The dead-time modeling, the throughput curves, the experimental time-interval distributions (TIDs) and the counting uncertainty of the recorded events of both the fast and the slow channels, measured with a planar CdTe (cadmium telluride) detector, will be presented. The throughput formula of a series of two types of dead-times is also derived. The results of dead-time corrections, performed through different methods, will be reported and discussed, pointing out the error on ICR estimation and the simplicity of the procedure. Accurate ICR estimations (nonlinearity < 0.5%) were performed by using the time widths and the TIDs (using 10 ns time bin width) of the detected pulses up to 2.2 Mcps. The digital system allows, after a simple parameter setting, different and sophisticated procedures for dead-time correction, traditionally implemented in complex/dedicated systems and time-consuming set-ups.
引用
收藏
页码:1190 / 1201
页数:12
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