Overview
EN ISO 11137-3:2017 - "Sterilization of health care products - Radiation - Part 3" provides guidance on dosimetric aspects used during the development, validation and routine control of radiation sterilization processes. It supports the requirements in ISO 11137‑1, ISO 11137‑2 and ISO/TS 13004 by describing best practice for dose measurement, calibration, uncertainty assessment and dosimetry-based decision making for gamma, electron beam and X‑ray sterilization.
Key topics and technical requirements
- Dosimetry systems and calibration
- Selection of appropriate dosimeters and dosimetry systems and traceability to national/international standards.
- Calibration procedures and the need for documented calibration records.
- Dose measurement and uncertainty
- Principles for obtaining a best estimate of dose, and application of uncertainty evaluation (including GUM methodology).
- Consideration of environmental effects (temperature, humidity) on dosimeter response.
- Dose setting and limits
- Guidance on establishing the maximum acceptable dose and the sterilization target dose based on dosimetric evidence.
- Qualification stages (IQ/OQ/PQ)
- Dosimetry requirements for Installation Qualification (IQ), Operational Qualification (OQ) and Performance Qualification (PQ).
- Specific considerations for gamma, electron beam and X‑ray irradiators, including loading patterns, dose mapping and data analysis.
- Routine monitoring and control
- Frequency and methods for routine dose measurements and process control to demonstrate ongoing conformance.
- Informative annexes
- Mathematical modelling, tables for dosimetry testing during IQ/OQ/PQ, tolerances and application of measurement uncertainty.
Practical applications and who uses this standard
EN ISO 11137-3:2017 is used by:
- Medical device manufacturers establishing sterilization processes and documentation for product release.
- Contract sterilization facilities (gamma, e‑beam, X‑ray) performing dose mapping, commissioning and routine control.
- Quality assurance and regulatory teams preparing technical files and demonstrating compliance with sterilization standards.
- Dosimetrists and process engineers implementing calibration, uncertainty analysis and dose-monitoring programs.
Practical uses include selecting and calibrating dosimeters, designing dose-mapping studies, setting process target doses, performing IQ/OQ/PQ activities, and defining routine dose-monitoring frequency to maintain validated sterilization performance.
Related standards
- ISO 11137‑1 (Requirements for development, validation and routine control)
- ISO 11137‑2 (Establishing sterilization dose)
- ISO/TS 13004 (Guidance on developing sterilization dose substantiation)
- Guide to the expression of uncertainty in measurement (GUM) - referenced for uncertainty evaluation
EN ISO 11137‑3:2017 is essential for anyone responsible for radiation sterilization dosimetry, ensuring traceable, reproducible dose measurements and compliant validation and control of sterile healthcare products.
