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Impurity absorption bands in the ultraviolet (1370 and 1960 Å) and infrared (2.8 μm) which may occur in various commercial crystals of LiF cannot be correlated with the thermoluminescence glowpeak at 210 °C, with the Mg or OH − content, or with each other. The present data fail to support the argument that impurity centers absorbing in the 2000 Å region play an essential role in the thermoluminescence process.
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Esther W. Claffy (1967) studied this question.
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