The Effect Doped Impurities in Thermoluminescence Phosphor of Natural Salt

We have measured the thermoluminescence of a number of natural NaCl crystals following irradiation at ambient temperature with the same dose (1 Gy) of beta- source. We compare the TL of pure samples and of samples doped with Mn, Eu and Dy ions. The effects of irradiation are determined using thermoluminescence. Factors investigated include the effects of different dopants on TL glow curves annealing samples at 500oC. Changes in TL glow curves relating to changes in the state of aggregation of the impurities produced are reported in this study. Perhaps the most significant effect is a temperature shift of the TL main glow peak compared to pure samples in the case of single doped NaCl: Mn; Eu and Dy. The magnitude of the shift depends on the type impurity. Here the main effect of different impurities is to influence the size of the TL intensity emission and not the structure of the glow curve. Discussion of results are in terms of current thermoluminescence theories.