Thermal Annealing Effects on the Thermoluminescence of LiF

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Abstract
Isothermal annealing before or after irradiation is found to have a definite effect upon the thermoluminescent glow curve of LiF (TLD-100). Post-irradiation annealing, by thermally releasing electrons from their traps, reduces the size of each peak in the glow curve. The two main dosimetry peaks each have a simple exponential decay consistent with the model of Randall and Wilkins, indicating trap depths of 1.19 and 1.25 eV respectively with frequency factors between 1011 and 1012 sec-1. Pre-irradiation annealing at 80 [degree]C for 24 hr reduces the area of the low temperature peaks by a factor of 10, while annealing at 125 [degree]C, 145 [degree]C or 175[degree]C for 3 hr reduces the area of the main dosimetry peaks by a factor of 2-5 and increases the height of one of the low temperature peaks by a factor of 1 1/2-3. The rate of cooling from temperatures greater than about 150 [degree]C affects the glow curve also. Rapid cooling in times of the order of seconds increases the heights of the low temperature peaks up to a factor of 4 compared to cooling in several minutes or more.

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