The effect of gamma-irradiation on positronium formation in polyethylene

• The effect of gamma -irradiation on positronium (Ps) formation, especially the decrement of Ps formation at room temperature, was studied in linear poly(ethylene). We found that chemical changes, such as oxidation, cross-linking, or radicals created by gamma -irradiation of similar to 50 kGy do not affect Ps formation very much. The decrement of Ps formation was probably caused by a temporary change of physical structure by irradiation that disappears by anneals in the temperature range from room temperature to 120 degreesC, gradually. (C) 2001 Elsevier Science Ltd. All rights reserved.

Nyckelord

positronium

poly(ethylene)

gamma-irradiation

radicals

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