Thermally stimulated polarisation and depolarisation currents (TSPC and TSDC) in LiF:Mg2+(TLD-100)

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Abstract
From a consideration of the temperature dependence of the Langevin function, thermally stimulated polarisation currents (TSPC) ought to exhibit a current reversal at temperature greater than the temperature of the TSPC maximum. The authors report measurements of TSPC and TSDC (depolarisation currents) in LiF:Mg2+ (TLD-100) in which the current reversal is clearly observed for the first time in alkali halides. The TSPC and TSDC signals arise from the orientation of Mg2+-Li+ vacancy dipoles, with an activation energy of 0.66 eV and a pre-exponential factor of 1014 s-1. By comparing the areas under the TSPC and TSDC curves, the value of the effective polarisation temperature in the TSDC measurement can be estimated.