Abstract
Standards EN 552 and ISO 11137, covering radiation sterilization, are technically equivalent in their requirements for the selection of the sterilization dose. Dose Setting Methods 1 and 2 described in Annex B of ISO 11137 can be used to meet these requirements for the selection of the sterilization dose. Both dose setting methods require a dose audit every 3 months to determine the continued validity of the sterilization dose. This paper addresses the subject of dose audit failures and investigations into their cause. It also presents a method to augment the sterilization dose when the number of audit positives exceeds the limits imposed by ISO 11137.
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