Radiation Sterilization
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A definition is SPEQ’s plain-language decode of how a term is used in practice, cited to the documents that define it. It is a practitioner reference, not legal or regulatory advice, it does not replace the definition in the source, and where a regulator’s wording differs the regulator’s wording governs.
A terminal sterilization method using gamma rays, electron beam, or X-ray radiation to inactivate microorganisms in medical devices and pharmaceutical components at ambient temperature without a gaseous sterilant. The sterilization dose is established and periodically verified using dose-setting methods based on product bioburden, or applied as a validated fixed dose.
Radiation sterilization is favoured for single-use plastic devices and packaged components because it penetrates sealed final packaging, leaves no chemical residue requiring aeration, and processes large volumes rapidly compared with gas or steam cycles.
Dose establishment methods (such as VDmax or bioburden-based dose setting) calculate the minimum dose needed to achieve the target sterility assurance level from the product’s baseline bioburden, and periodic dose audits confirm the dose remains adequate as manufacturing conditions evolve.
Material compatibility is a key constraint, since ionizing radiation can degrade certain polymers and discolour or embrittle some plastics, so dose selection balances microbial lethality against acceptable material property change.
- —Gamma, electron beam, and X-ray are the three compendial radiation modalities.
- —Can sterilize product through sealed final packaging.
- —Dose is established from product bioburden and periodically re-verified by dose audit.
- —Material compatibility, not just lethality, constrains the dose that can be applied.
ISO 11137-1; ISO 11137-2; ISO 11137-3
Frequently asked questions
What is Radiation Sterilization?
A terminal sterilization method using gamma rays, electron beam, or X-ray radiation to inactivate microorganisms in medical devices and pharmaceutical components at ambient temperature without a gaseous sterilant. The sterilization dose is established and periodically verified using dose-setting methods based on product bioburden, or applied as a validated fixed dose.
Which regulations cover Radiation Sterilization?
ISO 11137-1; ISO 11137-2; ISO 11137-3