Open Access
Issue
BIO Web Conf.
Volume 14, 2019
The 12th International Conference on the Health Effects of Incorporated Radionuclides (HEIR 2018)
Article Number 03012
Number of page(s) 2
Section Dosimetry and Dose Assessment: Oral presentations
DOI https://doi.org/10.1051/bioconf/20191403012
Published online 07 May 2019

1 ICIDOSE 2017

In 2017 Working Group 7 of the European Radiation Dosimetry Group (EURADOS WG7) has organized an intercomparison action for internal dose assessment for occupational exposures. Main aim of the intercomparison action was to test the practical applicability of the “Technical Recommendations for Monitoring Individuals for Occupational Intakes of Radionuclides” (“TECHREC Recommendations”) [1]

Among the four proposed cases, Case 1 (an artificial case of accidental inhalation of 60Co) was focussed on the impact of the changes introduced by the most recent ICRP recommendations [2], including the new report series on Occupational Intakes of Radionuclides (OIR) [3-5]. Additionally, the analysis of the results submitted for Case 4 (a complex real case of accidental inhalation of 241Am) provided useful feedbacks on the revised biokinetic models of ICRP.

2 The new ICRP recommendations and their impact on incorporation monitoring

In its 2007 recommendations ICRP introduced several changes affecting the estimation of the effective dose, among others new values for the radiation and for the tissue weighting factors, new definitions for the “remainder” tissue and for the calculation of the related equivalent dose, adoption of separate male and female reference computational phantoms and a new algorithm for the calculation of the effective dose. In addition to that, a new model for the Human Alimentary Tract (HAT), a revised model of the Human Respiratory Tract Model (HRTM) and updated systemic models for many radionuclides have been presented (3-6). All these changes affect not only the estimation of the effective dose, but also the calculation of the retention and excretion functions used to interpret the incorporation measurements.

3 ICIDOSE Cases

Case 1 was an artificial case purposely conceived to show that the two different approaches (analysis with current definitions and data vs. those adopted in the OIR reports) not only affect the final estimates of intake and dose, but also the procedure recommended by the TECHREC document for those estimates, requiring different levels of effort and expertise.

On the other side, the analysis of the results provided for Case 4 showed that the revised HRTM model and the OIR systemic model for americium radionuclides can successfully describe the retention data as measured in the real individuals. Following the procedure described in the IDEAS Guidelines (Version 2) for the Estimation of Committed Doses from Incorporation Monitoring Data [7], a very good fit of the data can be achieved with only slight changes of the HRTM americium specific parameters given in the draft of Part 4 of the OIR Report Series [8].

Finally, this analysis also enabled to check the applicability of the “dose per content” concept presented in the OIR Reports as an alternative method to estimate committed doses without the need to assess the related intake.

References

  • G. Etherington, A. Giussani, M.A. Lopez, P. Bérard, E. Blanchardon, B. Breustedt, C.M. Castellani, D. Franck, J. Marsh, D. Nosske, C. Challeton-de Vathaire. Technical Recommendations for Monitoring Individuals for Occupational Intakes of Radionuclides. EC Radiation Protection series (in press, 2018). [Google Scholar]
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  • C.M. Castellani, J.W. Marsh, C. Hurtgen, E. Blanchardon, P. Berard, A. Giussani, M.A. Lopez, EURADOS report 2013-01 (2013) available at http://www.eurados.org/en/Documents_Publications/Reports_documents [Google Scholar]
  • International Commission on Radiological Protection. Occupational Intakes of Radionuclides: Part 4. In preparation (Draft for public consultation published in July 2016). [Google Scholar]

© The Authors, published by EDP Sciences, 2019

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