On some annealing characteristics of heavy ion tracks in silicate minerals

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Abstract
We have studied the thermal annealing of fossil tracks stored in hypersthene crystals of the Johnstown meteorite. We have observed that the annealing of the tracks depend on their initial length and therefore of the charge of the incident ions. The shortest tracks are annealed at a lower temperature than the longer ones. These long tracks in turn have been found to be less thermally stable on the average than fission fragment tracks. After first pointing out Some difficulties in the study of the annealing of heavy ion tracks in solids, we discuss the possibility of using thermal annealing experiment to identify the origins of the tracks stored in naturally or artificially irradiated silicate minerals.

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