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Abstract
Alpha-quartz single crystals, which have been irradiated with gamma rays and with fast neutrons are studied with positron annihilation techniques. The annihilation spectra are independent of the gamma-ray dose the samples received (≤1 × 1011 rad). The neutron irradiated samples show spectra, evolving with increasing dose but saturating at about 8×l019 n/cm2. The saturation behaviour indicates its relation with the amorphization of the samples. The long-lived components, of the three-component analyses of the lifetime spectra, are longer for the heavily neutron irradiated samples than for unirradiated vitreous silica.