Ionic conductivity in KCl irradiated at room temperature

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Abstract
The ionic conductivity of pure KCl samples irradiated at room temperature with X- and gamma rays in a wide dose range has been studied. Some measurements in pure NaCl samples are also presented. The thermal annealing of the radiation induced effect on the ionic conductivity shows rather conclusively that this effect is not related to the radiation induced F-centres and their corresponding interstitial halogen atoms. The thermal recovery of the free-cation-vacancy concentration in irradiated KCl samples exhibits two recovery steps at 350 and 510-520 degrees C respectively. The latter step moves to 590 degrees C in heavily irradiated samples. Similar recovery steps have been found in quenched samples. The formation by irradiation of dislocations and divacancy clusters which act as dipole traps is considered.

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