Abstract
The thermal annealing of radiation damage induced by gamma radiation in NaCl crystals is studied by positron annihilation techniques. The results show that the concentration of positron annihilation centers (A center) decreases quickly at first upon heating, but then more slowly until a very slowly decreasing region, a ``pseudoplateau'' is reached. The A-center concentrations at which these pseudoplateaus are obtained depend on the temperatures at which the annealing processes are carried out. The kinetics of the annealing as observed by the positron annihilation technique is consistent with a bimolecular reaction model. The experimentally obtained activation energy for this process is ≈ 1.2 eV; this suggests the elimination of positive ion vacancies aggregates, which act as positron annihilation centers, by migrating anion vacancies at elevated temperatures.
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