Abstract
CsI(Tl) crystals of 1×1×10 cm 3 were exposed to 60Co γ rays with various doses in the range from 10 3 to 10 6 rad. The pulse height reduction, measured with a 137Cs isotope placed at the small end of the crystal opposite to a photomultiplier, varied from 28% at 1.58×10 3 rad to more than 85% at 1.83×10 6 rad. The radiation damage continued to be significantly saturated between 10 3 and 10 5 rad. Irradiation caused absorption of light at short wavelengths, mainly below 600 nm, making strongly irradiated crystals reddish. No sizable spontaneous recovery was observed. It was found that the damage quickly (within hours) recovers to a considerable extent by exposure to sunlight.
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