Abstract
The effect of quenching from 650 degrees C to room temperature as well as that of heavy predoses at room temperature on the thermoluminescence induced by X-irradiation at temperatures between 80 and 300K in KCl:Sr (80 ppm) samples have been investigated. These heavy predoses strongly reduce the glow peaks in the 170-300K range which are clearly related to interstitial centres involving impurity-vacancy dipoles. This result gives additional evidence to support the idea that such dipoles are also involved in the thermoluminescent processes operative above room temperature. The study of quenched samples has revealed the existence of a dipole aggregation process which is induced by irradiation. It is suggested that the energy transfer mechanism is the recombination of the radiation-induced interstitials and vacancies close to the dipoles, either during irradiation or in the thermoluminescence run.
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