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In commercial dosimeter material LiF : Mg : Ti the concentrations of the impurity ions are chosen to optimise the thermoluminescence. It has been assumed that the luminescence occurs by hole capture at a titanium defect site. However electron spin resonance has shown that the titanium is incorporated in the crystal as Ti3+ and Ti4+ ions with the possibility of charge compensation by three O2- ions. To test this suggestion we have surveyed the thermoluminescence from a wide range of LiF samples with variations in both Mg and Ti doping levels. Ion implantation of oxygen and titanium provided a clean method of modifying the impurity levels in the samples. Changes were observed in both the thermoluminescence intensities and the number of gow peaks and also in the spectrum of X-ray excited luminescence. The results are interpreted in terms of the [Ti4+, 3 O2-] defect complex

COLOUR CENTRES IN DOPED ALKALI HALIDES.THE ROLE OF OXYGEN AND TITANIUM IN THE LUMINESCENCE OF LiF : Mg : Ti