Title :
Radiation damage in BaF2 crystals
Author :
Woody, C.L. ; Kierstead, J.A. ; Levy, P.W. ; Stoll, S.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
fDate :
8/1/1992 12:00:00 AM
Abstract :
The change in optical transmission of a number of BaF2 crystals has been measured as a function of exposure to 60Co radiation up to a dose of 4.7×106 rad. Although some crystals exhibited a small change in transmission, a greater change in scintillation light output was observed. Several 25-cm-long crystals which have been irradiated showed large changes in both transmission and light output. Recovery from radiation damage was studied as a function of time and exposure to UV light. A long-lived radiation-induced phosphorescence was observed in all irradiated samples which was distinct from the standard fast and slow scintillation emissions. The emission spectrum of the phosphorescence was measured and showed a peak at ~330 nm, near the region of the slow scintillation component. Results are given on the dependence of the decay time of the phosphorescence with dose
Keywords :
barium compounds; radiation effects; scintillation counters; 25-cm-long crystals; 60Co radiation; BaF2 crystals; UV light; emission spectrum; long-lived radiation-induced phosphorescence; optical transmission; radiation damage; scintillation light output; Barium; Crystals; Laboratories; Loss measurement; Optical scattering; Phosphorescence; Propagation losses; Solid scintillation detectors; Time factors; Wavelength measurement;
Journal_Title :
Nuclear Science, IEEE Transactions on
