Thermoluminescence spectrum of gamma-irradiated natural calcium fluoride

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Abstract
The thermoluminescence glow curve of natural calcium fluoride crystals shows three distinct glow peaks between room temperature and 350 degrees C. Emission spectrum is investigated separately for each of the glow peaks in the range 200 to 1000 nm. The spectral similarity of emission associated with these glow peaks leads to the conclusion that they are associated with the release of either holes or electrons from different trapping sites and that the released carriers recombine with the same type of emitting centres. It is concluded that the glow peaks are due to the release of holes which on recombination with electrons trapped at rare-earth impurity ions give rise to their characteristic spectra.