Title :
Radiation damage in undoped CsI and CsI(Tl)
Author :
Woody, C.L. ; Kierstead, J.A. ; Levy, P.W. ; Stoll, S.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
Abstract :
Radiation damage has been studied in undoped CsI and CsI(Tl)-crystals using /sup 60/Co gamma radiation for doses up to approximately 4.2*10/sup 6/. Samples from various manufacturers were measured ranging in size from 2.54-cm-long cylinders to a 30-cm-long block. Measurements were made on the change in optical transmission and scintillation light output as a function of dose. Although some samples showed a small change in transmission, a significant change in light output was observed for all samples. Recovery from damage was also studied as a function of time and exposure to UV light. A short-lived phosphorescence was observed in undoped CsI, similar to the phosphorescence seen in CsI(Tl).<>
Keywords :
caesium compounds; gamma-ray effects; light transmission; scintillation; scintillation counters; thallium; /sup 60/Co gamma radiation; 2.54 to 30 cm; 4.2 Mrad; CsI; CsI:Tl; UV light; optical transmission; scintillation light output; short-lived phosphorescence; Crystals; Gamma rays; Laboratories; Manufacturing; Optical sensors; Phosphorescence; Purification; Radiation detectors; Size measurement; Time measurement;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.259163
