Abstract
Optical absorption spectroscopy plays an exceptional role in the identification of charge traps responsible for the different TL peaks of the TL phosphors, Experiments carried out under different conditions, e.g. with different types of ionising radiation and/or different dose rates, applying different annealing procedures and/or different storage times after the irradiation, may lead to contradictory results. Therefore, a systematic investigation was conducted of the build-up and decay characteristics of the optical absorption bands of different LiF:Mg,Ti single crystal samples. Important changes were found in the long (hours and days) time scale. For example, the 350 nm optical absorption increases continuously in the Mg free LiF:Ti sample, while the intensities of the 310nm and 380nm absorption bands decrease in the sample containing Mg even several hours after irradiation with 5μs, 4 MeV linear accelerator electron pulses. These experimental results may have serious consequences for the interpretation of optical absorption data and for the understanding of defect processes and energy storage mechanisms of thermoluminescence in LiF:Mg,Ti.
Published Version
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