Abstract
The radiation sensitivity, time stability and optical sensitivity of [Si45−] paramagnetic centers in natural zircon crystals, particularly those from the Late Neopleistocenic tuff of the Elbrus Volcano, have been studied. Optical bleaching was shown to result in the recombination of [Si45−] centers, while the concentration of centers increases in the absence of light due to the internal radiation background. The data obtained show the infeasibility of using [Si45−] centers in zircons as paleodosimeters in conventional dating methods using electron paramagnetic resonance (EPR) spectroscopy. New specific techniques need to be developed for EPR dating of zircons.
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