is the most frequently used sterilization method for plastics. The ionizing radiation amounts are between 12 and 50 kGy. The radiation penetrates the material and destroys the bioburden there 32. Thereby, a sterility security value of at least 10-6 must be reached according to ISO-standard 33. During gamma-sterilization the material further polymerizes. Protecting additives are necessary to avoid too strong oxidation or damage to the material 9. Cytotoxically active leachables and extractables can be built during gamma-sterilization 20. See bags and bDtBPP.