Modelling of a Single-Channel Beta-Gamma Coincidence Phoswich Detector Using Geant4 for the Conversion Electron Energy Peak Resolution and Beta-Gamma Coincidence Efficiency Improvement

被引：3
|
作者：
Zhang, Weihua [1 ]
Mekarski, Pawel [1 ]
Bean, Marc [1 ]
Yi, Jing [1 ]
Ungar, Kurt [1 ]
机构：
[1] Radiat Protect Bur Hlth Canada, Ottawa, ON K1A 1C1, Canada
来源：
PURE AND APPLIED GEOPHYSICS | 2014年 / 171卷 / 3-5期
关键词：
Phoswich detector design; Monte Carlo simulation; FWHM; xenon radioisotopes; RADIOACTIVE XENON; SYSTEM;
D O I：
10.1007/s00024-012-0494-4
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
In this study, an optimized single-channel phoswich well detector design has been proposed and assessed in order to improve beta-gamma coincidence measurement sensitivity of xenon radioisotopes. This newly designed phoswich well detector consists of a plastic beta counting cell (BC404) embedded in a CsI (Tl) crystal coupled to a photomultiplier tube. The BC404 is configured in a cylindrical pipe shape to minimise light collection deterioration. The CsI (Tl) crystal consists of a rectangular part and a semi-cylinder scintillation part as a light reflector to increase light gathering. Compared with a PhosWatch detector, the final optimized detector geometry showed 15 % improvement in the energy resolution of a Xe-131m 129.4 keV conversion electron peak. The predicted beta-gamma coincidence efficiencies of xenon radioisotopes have also been improved accordingly.
引用
收藏
页码：621 / 627
页数：7
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