Title :
A Compton-suppressed phoswich detector for radioxenon measurements
Author :
Farsoni, A.T. ; Alemayehu, B. ; Alhawsawi, A.
Author_Institution :
Dept. of Nucl. Eng. & Radiat. Health Phys., Oregon State Univ., Corvallis, OR, USA
Abstract :
A phoswich detector with Compton suppression capability has been developed and assembled for measuring low concentration of xenon radioisotopes in the atmosphere. 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 from the first (BC-400) and second (CsI(Tl) crystal) scintillation layers. To identify and reject scattered photons from CsI(Tl) crystal, the crystal is surrounded by a BGO scintillation layer. In this paper, detector assembly steps and our recent measurements with lab sources and radioxenon isotopes produced in the Oregon State University´s TRIGA reactor will be discussed.
Keywords :
Compton effect; caesium compounds; radioisotopes; solid scintillation detectors; xenon; BC-400; BGO scintillation layer; Compton suppression capability; Compton-suppressed phoswich detector; CsI(TI) crystal; Oregon State University; TRIGA reactor; beta-gamma coincidence events; coincidence energy absorption; detector assembly steps; first scintillation layer; lab sources; scattered photons; scintillation layers; second scintillation layer; xenon radioisotope measurements; Coatings; Energy resolution; Lead; Nitrogen;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE
Conference_Location :
Valencia
Print_ISBN :
978-1-4673-0118-3
DOI :
10.1109/NSSMIC.2011.6154451
