A Phoswich Detector With Compton Suppression Capability for Radioxenon Measurements

被引：22

作者：

Farsoni, Abi T. ^{[1
]}

Alemayehu, Bemnet ^{[1
]}

Alhawsawi, Abdulsalam ^{[1
]}

Becker, Eric M. ^{[1
]}

机构：

[1] Oregon State Univ, Dept Nucl Engn & Radiat Hlth Phys, Corvallis, OR 97331 USA

来源：

IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 2013年 / 60卷 / 01期

关键词：

Compton suppression; phoswich detector; pulse shape discrimination; radioxenon measurement; MCNP ANALYSIS; SPECTROSCOPY; DISCRIMINATION; SCINTILLATORS; XENON; ALPHA; BGO;

D O I：

10.1109/TNS.2012.2226606

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A phoswich detector with Compton suppression capability has been developed and tested for measuring xenon radioisotopes via a beta-gamma coincidence measurement technique. The phoswich detector has been designed with three scintillation layers. Beta-gamma coincidence events from radioxenon isotopes are identified when a coincidence energy absorption is detected in the first (BC-400) and second (CsI(Tl) crystal) scintillation layers. To identify and reject scattered photons from the CsI(Tl) crystal, the crystal is surrounded by a BGO scintillation layer. Our measurements show that the Compton suppression mechanism reduces the Compton continuum from 662 keV photons by 20-50% in the low-energy region of spectrum. Our beta-gamma coincidence measurements with Xe-135 and Xe-133 radioisotopes show energy resolutions (FWHM) of 13%, 46% and 24% for 250 keV, 30 keV and 80 keV gamma-ray peaks, respectively. In this paper, the detector design, assembly steps, digital pulse shape discrimination technique, and our recent measurements with radioactive lab sources and xenon radioisotopes are discussed.

引用

页码：456 / 464

页数：9

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