A Phoswich Detector With Compton Suppression Capability for Radioxenon Measurements

作者：Farsoni Abi T^*; Alemayehu Bemnet; Alhawsawi Abdulsalam; Becker Eric M

来源：IEEE Transactions on Nuclear Science, 2013, 60(1): 456-464.

DOI：10.1109/TNS.2012.2226606

• Compton suppression
• phoswich detector
• pulse shape discrimination
• radioxenon measurement

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.

• 出版日期2013-2