Abstract
Abstract Crystalline quartz samples, irradiated with fast neutrons are studied with positron annihilation techniques. The results confirm that the amorphization process induced by the irradiation leads, at saturation doses (øt=1020 n/cm2), to a physical state which is different from the one in vitreous silica. The behaviour of the positron annihilation pick-off lifetime and intensity in the irradiated material can be understood on the basis of a spikelike mechanism for the amorphization process.
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