Positron annihilation in gamma irradiated crystals |
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Authors: | P. Ramasamy T. Nagarajan V. Devanathan |
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Affiliation: | Department of Nuclear Physics, University of Madras, Madras 600 025, India |
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Abstract: | The angular correlation between the two gamma-quanta arising from positron annihilation in untreated and gamma-irradiated alkali halides is reported. For low level gamma irradiation the percentage of positrons annihilating with F-centre electrons is not very significant. When the F-centre concentration is increased to as much as 1.5 × 1017 per cm3, about 15 per cent of positrons annihilate with F-centre electrons. The angular correlation curve becomes progressively narrower with increase in F-centre concentration. Positrons annihilating in gamma-irradiated crystals reduce the F-centre considerably. The results of a systematic investigation on F-centre bleaching by positron annihilation are reported. |
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