From the room temperature and low temperature optical bleaching behavior of γ-ray induced optical absorption bands in TLD-100 (LiF:Mg, Ti) the optical absorption bands at 4.0 and 5.5 eV are attributed to Z2 and Z3 centers, respectively, while the absorption band at 3.24 eV appears to be due to a Z2 center which has captured an additional electron. A center, stable at low temperatures with an optical absorption at 3.5 eV, results from the trapping of electrons, released by bleaching at 90 K.
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Mehta et al. (1977) studied this question.
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