gamma-rays + PVC + EO = OK.
D005023:Ethylene Chlorohydrin; D005027:Ethylene Oxide; D005720:Gamma Rays; D011143:Polyvinyl Chloride / Q000528:radiation effects*; D011145:Polyvinyls / Q000528:radiation effects*; D012138:Respiratory Therapy / Q000295:instrumentation; D013242:Sterilization / Q000379:methods*