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Gamma irradiation-induced free radicals have been investigated for 4.5 years in medical grade ultra-high molecular weight polyethylene resins, GUR 4120, GUR 4150 and Himont 1900, at room temperature (23 o C) in absence (vacuum) or presence of oxygen (air), and at 75 o C in vacuum. In vacuum, the primary radicals (predominantly allyl) decayed following Y=Y R +ae- bt...