Latest update: 19/03/2021

Technical recommendations for monitoring individuals for occupational intakes of radionuclides

This report presents technical recommendations for the individual monitoring of workers interms of occupational intake of radionuclides. It aims to provide guidance on those aspects of the implementation of the provisions of the Euratom Basic Safety Standards Directive related to individual monitoring of internal exposure, and to encourage harmonisation and eventual mutual recognition of services.

The report presents a complete account of the principles of individual monitoring and internal dosimetry and develops comprehensive guidance and recommendations on best practice. The recommendations cover: (i) the roles and duties of dosimetry services; (ii) monitoring programmes; (iii) monitoring methods; (iv) assessment of internal doses arising from monitoring measurements; (v) accuracy requirements and uncertainty analysis; (vi) quality assurance, and criteria for approval and accreditation; and (vii) radon measurement and dosimetry for workers. Supporting information is provides in the annexes. Topics addressed in the annexes include biokinetic and dosimetric models, monitoring and dosimetry for first responders after a major accident, and the application of internal dosimetry when assessing health risks. Finally, there is a set of examples that demonstrate key features of the technical recommendations.

The document takes account of Council Directive 2013/59/Euratom as well as the developments embodied in the ICRP Occupational Intakes of Radionuclides report series. As part of the project, the document has undergone extensive stakeholder consultation.

This guideline is part of a series on radiation safety; the previous issues have been published concerning prevention in the general population.


  • Purpose, Context and Scope, and Implementation by Internal Dosimetry Services
  • General Principles of Monitoring Individuals for Occupational Intakes of Radionuclides
  • Monitoring Programmes
  • Methods of Individual and Workplace Monitoring
  • Routine and Special Dose Assessment
  • Accuracy Requirements and Uncertainty Analysis
  • Quality Assurance and Criteria for Approval and Accreditation
  • Radon Measurement and Dosimetry for Workers


  1. Reference Biokinetic and Dosimetric Models
  2. Examples of monitoring programme design and internal dose assessment
  3. Monitoring and Internal Dosimetry for First Responders in a Major Accident at a Nuclear Facility
  4. Internal Dosimetry for Assessment of Risk to Health
  5. Compilation of Recommendations
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