Thermoluminescence in LiF (TLD-100) and LiF crystals irradiated at room temperature

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Abstract
The thermoluminescence and the thermal stability of colour centres induced by room temperature irradiation at doses between 1 and 107 Gy in LiF (TLD-100) and LiF single crystals have been studied. The pre-exponential factors and activation energies have been obtained by the isothermal method for most of the glow peaks found in unquenched samples of these materials. The values are significantly smaller than those previously reported by other authors in LiF (TLD-100). This difference has been ascribed to the effect on the light emission intensity of the impurity aggregation occurring in quenched samples while they are heated to observe their thermoluminescence. It has been found that in LiF samples the F centres exhibit thermal annealing stages at the temperatures at which the glow peaks occur. The same correlation has been found in LiF (TLD-100) samples except for peak VI (commonly labelled 5) which is correlated with a large annealing step in the 310 nm optical absorption band (Z2 centres).