A compton-suppressed phoswich detector for gamma spectroscopy

被引：11
|
作者：
Farsoni, A. T. [1 ]
Alemayehu, B. [1 ]
Alhawsawi, A. [1 ]
Becker, E. M. [1 ]
机构：
[1] Oregon State Univ, Corvallis, OR 97330 USA
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2013年 / 296卷 / 01期
关键词：
Phoswich detectors; Scintillators; Compton suppression; Gamma spectroscopy; Digital pulse-shape discrimination; SAMPLES; CS-137;
D O I：
10.1007/s10967-012-2009-2
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A phoswich detector with two scintillation layers has been designed and assembled at Oregon State University. This detector is able to identify and reject Compton events and ultimately reduce the Compton continuum in gamma energy spectra. In this detector, CsI(Tl) crystal is used to primarily detect photoelectric events. The CsI(Tl) crystal is partially surrounded by a BGO crystal layer to capture and identify Compton-scattered photons. Both crystals are optically coupled to a single photomultiplier tube. A real-time, FPGA-based digital pulse shape analysis was developed to discriminate and reject Compton-induced pulses from the CsI(Tl) crystal. All the digital pulse processing functions including pulse shape discrimination analysis, pile-up rejection and energy measurement were implemented in an on-board FPGA device. In this paper, the results of recent measurements using radioactive lab sources will be presented and discussed.
引用
收藏
页码：63 / 68
页数：6
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