Abstract
Color centers in undoped and U 3+-doped CaF 2 crystals induced by γ-irradiation with different doses were studied by differential absorption and Raman spectra. Multiple color centers and conversion among them were caused in undoped CaF 2 with the creation of radiation defects. In U 3+:CaF 2 crystal, trivalent uranium was demonstrated to act as hole trap in the process of γ-irradiation, which was ionized to tetravalent. This process was accompanied by the formation of F 2 + centers, but without additional background absorption due to radiation defects.
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