Ultra-high molecular weight polyethylene (UHMWPE) is the material of choice in total joint replacement for hip cup and knee plateau because of its bio compatibility. The devices made of UHMWPE should be sterilized before implantation within the body and most reliable method for the purpose is gamma irradiation. However, sterilization with gamma rays generates free radicals which remained inside the crystalline core of UHMWPE. These radicals are the precursor of oxidation degradation of UHMWPE thus limiting the lifetime of artificial joints.We believe that, to eliminate these free radicals...