Abstract
PWO crystals doped with yttrium were grown with the Bridgmanmethod in platinum crucible and by using an indigenously developedresistive heating furnace. After an exposure of γ-ray from a 60Cosource, with the dose rate of 15 rad/h for 20 h, the light outputincreases for about 15%, accompanied with vanishing of an opticalabsorption band at 420 nm. The excitation and emission spectra of PWOcrystals were measured before and after irradiation with different doserates. The optical absorption band at 420 nm was also found in the PWOsample annealed in oxygen-rich atmosphere. It is suggested that theabsorption band at 420 nm is related to Pb3+ point defects existingin the PWO crystal. The unusual change of light output afterirradiation probably results from the transformation of lead ions fromPb3+ to Pb2+.
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