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International intercomparison on internal dose assessment (ICIDOSE 2017).

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Summary

The ICIDOSE 2017 intercomparison exercise demonstrated the practical applicability of new technical recommendations (RP188) for internal dose assessment. Results showed improved harmonization in occupational radionuclide monitoring, validating the RP188 guidelines.

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Area of Science:

  • Radiological Protection
  • Internal Dosimetry
  • Occupational Health

Background:

  • Internal dose assessment intercomparison exercises are crucial for verifying dosimetry services and promoting harmonized assessments.
  • No international intercomparisons for internal dosimetry had been conducted for over a decade prior to this study.
  • The European Commission developed 'Technical Recommendations for Monitoring Individuals for Occupational Intakes of Radionuclides' (RP188) between 2014-2016.

Purpose of the Study:

  • To test the practical applicability of the RP188 recommendations through a new intercomparison action.
  • To assess the performance of internal dosimetry services in occupational monitoring scenarios.
  • To evaluate the harmonization of internal dose assessments across different participants and countries.

Main Methods:

  • Organized the ICIDOSE 2017 intercomparison action by the European Radiation Dosimetry Group (EURADOS) Working Group 'Internal Dosimetry'.
  • Proposed four distinct case studies: simulated 60Co inhalation, real 125I inhalation, complex 234+235+238U incorporation, and accidental 241Am incorporation with DTPA treatment.
  • Collected results from 66 participants across 26 countries and compared them against reference solutions based on RP188.

Main Results:

  • A small number of outliers were observed in the 60Co, 125I, and 241Am cases, with geometric standard deviations (GSDs) of 1.07, 1.04, and 1.43, respectively.
  • The spread of results for these cases showed improvement compared to previous intercomparison exercises, indicating enhanced harmonization.
  • A wider spread of results was noted for the uranium case due to uncertainties in exposure pathways and patterns, highlighting challenges in complex scenarios.

Conclusions:

  • The ICIDOSE 2017 exercise successfully demonstrated the practical applicability and benefits of the RP188 recommendations.
  • The RP188 guidelines contribute to improved harmonization in internal dose assessment for occupational radionuclide monitoring.
  • Further attention may be needed for complex exposure scenarios, particularly those with unknown parameters, to refine assessment methodologies.