Digital processing of signals from LaBr3:Ce scintillation detectors

被引：15

作者：

Nakhostin, M. ^{[1
]}

Podolyak, Zs ^{[1
]}

Regan, P. H. ^{[1
]}

机构：

[1] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

来源：

JOURNAL OF INSTRUMENTATION | 2014年 / 9卷

关键词：

Data processing methods; Digital signal processing (DSP); Scintillators and scintillating fibres and light guides; TIME RESOLUTION; TIMING METHODS; PERFORMANCE; ELECTRONICS; ARRAY;

D O I：

10.1088/1748-0221/9/12/C12049

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In this paper, we report on the results of digital signal processing of LaBr3(Ce) detectors. The photomultiplier (PMT) output signals from two cylindrical LaBr3(Ce) detectors (1.5" diameter and 2" tall) were directly digitized with an ultrafast digitizer (sampling rate up to 4 GSample/s and 10-bits resolution) and the energy and timing information were extracted through offline analysis of the pulses. It is shown that at high sampling rates (4 GS/s) a simple integration of pulses is sufficient to reproduce the analogue energy resolution of the detectors (3.5% at 662 keV energy) and by employing a digital version of constant-fraction discrimination (CFD) timing a time resolution of 240 ps (FWHM) is achieved at the energy lines of Co-60. The effects of pulse sampling rate were studied, indicating a degradation of the performance of the detectors with reducing the pulse sampling rate. In particular, it was found that at sampling rates below 1 GS/s, the digital timing can be limited by the aliasing error. By using an anti-aliasing filter, a time resolution of 375 ps (FWHM) and an energy resolution of 3.5% at 662 keV were achieved with a sampling rate of 500 MS/s.

引用

页数：13

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