The optical spectra of Pu3+, Pu4+, and color centers, in CaF2 have been measured. Tetravalent Pu and the color centers are formed in the crystal as the result of the decay of the Pu nucleus. Fluorescence spectra of Pu3+ and Pu4+ are also obtained.
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McLaughlin et al. (1968) studied this question.
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