Abstract
Commercial high density polyethylene samples have been irradiated by gamma rays with doses ranging from 10 to 200 KGy. Positron annihilation lifetime measurements have been performed to study the effect of gamma radiation on the structure of polyethylene. The lifetime, τ 3, associated with the pick-off process, in which the positron in o-Ps annihilates with an electron from the surrounding material, and its intensity, I 3, are measured as a function of gamma dose. It can be concluded that the effect of gamma irradiation on polyethylene results in intensive formation of new bonds or cross-linking from 10 to around 100 KGy. Saturation of I 3 from 100 to 200 KGy may indicate the achievement of structural stability.
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