Overview
ISO 12749-2:2022 - "Nuclear energy, nuclear technologies, and radiological protection - Vocabulary - Part 2: Radiological protection" is an international vocabulary standard that defines and harmonizes terms used in radiological protection. The second edition (2022) updates and expands the first edition (2013), merging measurement and monitoring headings and adding terms related to emergency situations. Its primary purpose is to facilitate clear, consistent communication across the nuclear sector, medical uses of radiation, regulatory bodies and technical specialists.
Key topics
This part of ISO 12749 provides authoritative definitions and conceptual arrangements for radiological protection, including:
- General radiological protection concepts (e.g., radiological protection, radiation source, radioactive material, radioactive contamination).
- Biological effect terms related to radiation impact on health and biota.
- Radiation exposure and dose quantities (dose, absorbed dose, committed dose, committed effective dose, dose limit, dose constraint, ALARA/optimization).
- Measurement and radiological monitoring (instruments, derived limits such as DAC - derived air concentration - and practical parameter values used for assessments).
- Technical aspects affecting instrumentation, procedures and source control.
- Regulatory and emergency terminology that supports compliance, protective actions and emergency response.
- Methodology used to develop the vocabulary (Annex A) and bibliographic references to IAEA, ICRP, ICRU, ISO/IEC standards and other authoritative sources.
Practical applications
ISO 12749-2:2022 is a reference vocabulary used to reduce ambiguity and improve interoperability across disciplines that handle ionizing radiation:
- Regulators and policymakers use consistent definitions when drafting regulations, standards and licensing documents.
- Radiation protection officers and safety specialists rely on standardized terms for procedures, training and dose assessment (e.g., understanding ALARA, dose limits, DAC calculations).
- Nuclear industry and facilities apply the vocabulary in operating procedures, safety cases and technical documentation.
- Medical and research communities (nuclear medicine, radiotherapy, diagnostic imaging) benefit from shared language for patient protection and dosimetry.
- Manufacturers and testing laboratories use the standard to describe instrumentation, monitoring systems and compliance reporting.
- Emergency responders and planners use the emergency-related terms to coordinate protective actions and communication.
Related standards and sources
ISO 12749-2:2022 cross-references and aligns with established international documents, including:
- IAEA Safety Glossary and Basic Safety Standards
- ICRP and ICRU publications
- ISO/IEC 80000-10 (quantities and units) and related ISO vocabulary parts
- BIPM and VIM references
Using ISO 12749-2:2022 helps organizations ensure consistent, precise terminology in documentation, training, risk assessment and regulatory compliance across all applications of ionizing radiation.
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