A Phoswich Detector with Compton Suppression Capability for Radioxenon Measurements Public Deposited

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  • 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 ¹³⁵Xe and ¹³³Xe radioisotopes show energy resolutions (FWHM) of 13%, 46% and 24% for 250 keV, 30keV 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.
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  • Farsoni, A.T.; Alemayehu, B.; Alhawsawi, A.; Becker, E.M., "A Phoswich Detector With Compton Suppression Capability for Radioxenon Measurements," Nuclear Science, IEEE Transactions on , vol.60, no.1, pp.456,464, Feb. 2013 doi: 10.1109/TNS.2012.2226606
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