Correlation of Optical Absorption with Thermoluminescence of Thermally Treated LiF Crystals

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Abstract
The thermoluminescent intensity of LiF crystals thermally treated in air is smaller than that of crystals treated in argon gas, and moreover, decreases with the annealing temperature and time. It has been noted that, in comparison with the optical transmission of the original crystals, the transmission of samples treated in air decreases in the region of wavelengths of visible light, and that furthermore, the transmission declines with increasing annealing temperature and annealing time. Infrared absorption troughs corresponding to OH and CO3 anions are observed in the spectra of crystals treated in air. These anions present in the LiF crystals contribute to lowering the thermoluminescent intensity. When the LiF crystals treated in air are cooled in acid, the thermoluminsecent intensity is raised and the absorption troughs become shallower.