Effect of pre-irradiation deformation on thermoluminescence of divalent impurity doped alkali halide crystals

The effect or pre-irradiation deformation on the thermoluminescence (TL) of alkali halide crystals has been reported. The pre-irradiation deformation causes increase in the thermoluminescence intensity corresponding to both t he TL glow peaks of alkali halide crystals. The dependence of TL intensity corresponding to first and second TL peaks on pre-irradiation deformation f ollows the relations, I-mt = I-m1(0), exp(xi epsilon)and I-m2 = I-m2(0) exp xi'epsilon respectively. It is shown that the dislocation debris created d uring prior deformation of crystals trap the interstitials, which causes de crease in the probability of back reaction, i.e.. the recombination between interstitials anti vacancies. This results increase in the probability of the formation of stable F-centres. Consequently. for. the same radiation do ses given to the crystals. the density of F-centres and thereby the TL inte nsity increases with the pre-irradiation deformation of alkali halide cryst als.