ISO 11137-3:2017

Overview

ISO 11137-3:2017 - "Sterilization of health care products - Radiation - Part 3" provides non‑normative guidance on dosimetric aspects for the development, validation and routine control of radiation sterilization processes. It explains how to meet the dosimetry requirements specified in ISO 11137-1, ISO 11137-2 and ISO/TS 13004, focusing on dose measurement, traceability and uncertainty for gamma, electron beam and X‑ray sterilization.

Key topics and requirements

• Dosimetry fundamentals
  • Definitions (absorbed dose, dose uniformity ratio, direct vs indirect measurements).
  • Dosimetry system components (dosimeters, instruments, reference standards, procedures).
• Dose measurement and uncertainty
  • Selection and calibration of dosimetry systems and the need for traceability to national/international standards.
  • Application of the Guide to the Expression of Uncertainty (GUM) and radiation‑specific uncertainty considerations.
  • Best estimate of dose and how environmental factors (temperature, humidity) affect dosimeter response.
• Sterilization dose activities
  • Guidance on establishing the maximum acceptable dose and the sterilization dose used for product substantiation and routine processing.
• Qualification and validation (IQ/OQ/PQ)
  • Installation Qualification (IQ), Operational Qualification (OQ) and Performance Qualification (PQ) guidance for gamma, electron beam and X‑ray irradiators.
  • Loading patterns, dose mapping, dosimetry approaches and analysis of dose mapping data.
• Routine monitoring and control
  • Frequency and methods for routine dose measurements and control to ensure ongoing process consistency.
• Informative annexes
  • Mathematical modelling, recommended dosimetry testing during IQ/OQ/PQ, tolerances and uncertainty application in dose setting.

Practical applications and users

ISO 11137-3:2017 is intended for professionals involved with radiation sterilization of medical devices and health care products, including:

• Sterilization validation engineers and process owners
• Quality and regulatory affairs specialists (ISO 13485 stakeholders)
• Dosimetrists and calibration laboratories
• Irradiator operators (gamma, e‑beam, X‑ray)
• Contract sterilization service providers

Use cases:

• Designing and validating a radiation sterilization process
• Selecting and calibrating dosimetry systems and establishing measurement traceability
• Performing IQ/OQ/PQ and dose mapping for irradiators
• Implementing routine monitoring and documenting dose measurement uncertainty for regulatory compliance

Related standards

• ISO 11137-1 - Requirements for development, validation and routine control
• ISO 11137-2 - Establishing the sterilization dose
• ISO/TS 13004 - Substantiation of a selected sterilization dose (VDmax method)
• ISO 13485 - Quality management systems for medical devices

Keywords: ISO 11137-3:2017, radiation sterilization, dosimetry, dose measurement, dose uncertainty, sterilization validation, IQ OQ PQ, medical device sterilization.