Alterations to the far infrared spectrum of polycrystal CsI due to nuclear irradiation or thermal treatment are studied. Pure and cerium doped crystals were used. The transmittance loss due to irradiation reaches 50% and stabilizes at that level for irradiation doses less bhan or equal to 1 Mrad. The transmittance loss is smaller for the cerium doped crystal. Heat treatment at 115°C–300°C of pre irradiated samples also causes a significant reduction of the transmittance, showing that high temperature annealing is not a useful approach to restore the transmission.
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