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The change in the emission spectrum of irradiated thermoluminescent lithium fluoride is investigated as a function of specimen temperature. The emission peak energy rises with temperature and it is suggested that a temperature dependence upon the luminescent efficiency of the recombination processes is responsible rather than an association of specific emission peaks with individual glow peaks.

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Studies of the pre-irradiation isothermal fading of glow peaks in thermoluminescent dosimetry grade lithium fluoride have shown that two peaks are associated with divalent impurity-positive ion vacancy dipoles, not one as previously thought. The decay of these peaks is shown to obey second-order kinetics with an activation energy of 0·85±0·05 ev.The implications of these results for practical dosimetry are discussed.