The color center behaviors in γ-irradiated ruby were studied. The additive absorption spectra due to γ-irradiation are superposition of four bands each peak of which was found to be 220, 280, 370 and 460 mµ. From the observation of formation and annealing processes of these color centers, it is concluded that in aluminum oxide the additional lattice defect can not be created by γ-irradiation and the nominal amount of impurity will determine the color center concentration. The origins of four absorption bands are also discussed and the presence of Cr 2+ ions are suggested to be probable.
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Maruyama et al. (1964) studied this question.
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