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Color centers of CaF crystals subjected to three high-dose gamma-ray irradiation treatments were studied. Three absorption bands at 349, 409 and 478 nm are ascribed to the F interstitials through the variation in difference additional absorption values. The transformation of interstitial F atoms to F ions (F) is demonstrated using data with increasing radiation dose. The decrease in the 600 nm absorption band and the occurrence of the 580 nm band correspond to F center conversion to F center. The complex (F-F) might be associated with the 962 and 1196 nm bands. [ABSTRACT FROM AUTHOR]