DOI QR코드

DOI QR Code

Verification of Harmonization of Dose Assessment Results According to Internal Exposure Scenarios

  • Kim, Bong-Gi (Nuclear and Radiation Safety Engineering, University of Science and Technology) ;
  • Ha, Wi-Ho (Korea Institute of Radiological and Medical Sciences) ;
  • Kwon, Tae-Eun (Korea Institute of Radiological and Medical Sciences) ;
  • Lee, Jun-Ho (Nuclear and Radiation Safety Engineering, University of Science and Technology) ;
  • Jung, Kyu-Hwan (Nuclear and Radiation Safety Engineering, University of Science and Technology)
  • Received : 2018.09.28
  • Accepted : 2018.12.04
  • Published : 2018.12.31

Abstract

Background: The determination of the amount of radionuclides and internal dose for the worker who may have intake of radionuclides results in a variation due to uncertainty of measurement data and ingestion information. As a result of this, it is possible that for the same internal exposure scenario assessors could make considerably different estimation of internal dose. In order to reduce this difference, internal exposure scenarios for nuclear facilities were developed, and intercomparison were made to determine the harmonization of dose assessment results among the assessors. Materials and Methods: Seven cases on internal exposures incidents that have occurred or may occur were prepared by referring to the intercomparison excercise scenario that NRC and IAEA have carried out. Based on this, 16 nuclear facilities concerned with internal exposure in Korea were asked to evaluate the scenarios. Each result was statistically determined according to the harmonization discrimination criteria developed by IDEAS/IAEA. Results and Discussion: The results were evaluated as having no outliers in all 7 cases. However, the distribution of the results was spread by various causes. They can be divided into two wide categories. The first one is the distribution of the results according to the assumption of the intake factors and the evaluation factors. The second one is distribution due to misapplication of calculation method and factors related to internal exposure. Conclusion: In order to satisfy the harmonization criteria and accuracy of the internal exposure dose evaluation, it is necessary that exact guidelines should be set on low dose, and various intercomparison cases also be needed including high dose exposure as well as the specialized education. The aim of the blind test is to make harmonization evaluation, but it will also contribute to securing the expertise and high quality of dose evaluation data through the discussion among the participants.

References

  1. Belgian Nuclear Research Centre. IDEAS/ DAEA intercomparison exercise on internal dose assessment. SCK.CEN-BLG-1018. 2005;1-11.
  2. Doerfel H, et al. General guidelines for the assessment of internal dose from monitoring data: progress of the IDEAS project. Radiat. Prot. Dosim. 2007;125(1-4):19-22. https://doi.org/10.1093/rpd/ncl132
  3. International Atomic Energy Agency. Methods for assessing occupational radiation doses due to intakes of radionuclides. Safety Reports Series No.37. 2004;28-30.
  4. International Organization for Standardization. Radiation protection - dose assessment for the monitoring of workers for internal radiation exposure. ISO. 27048:2011;7-28.
  5. Castellani CM, Marsh JW, Hurtgen C, Blanchardon E, Berard P, Giussani A, Lopez MA. EURADOS-IAEAS guidelines (version 2) for the estimation of committed doses from incorporation monitoring data. Radiat. Prot. Dosim. 2015; 170(1-4):17-20. https://doi.org/10.1093/rpd/ncv457
  6. Forschungszentrum K. 3rd European intercomparison exercise on internal dose assessment: Needs for harmonisation. FZKA-6457;2000;9.
  7. Hui TE, Loesch RM, McDonald JC. The second internal dosimetry intercomparison study of the US Department of Energy. Radiat. Prot. Dosim. 1997;72(2):131-138. https://doi.org/10.1093/oxfordjournals.rpd.a032083
  8. Doerfel H, Andrasi A, Cruz-Suarez R, Castellani CM, Hurtgen C, Marsh J, Zeger J. IAEA/IDEAS intercomparison exercise on internal dose assessment. Radiat. Prot. Dosim. 2007;125(1-4):56-60. https://doi.org/10.1093/rpd/ncl540
  9. International Commission on Radiological Protection. Report on the task group reference man. ICRP 23. 1975;367.
  10. International Commission on Radiological Protection. Individual monitoring for internal exposure of workers replacement of ICRP Publication. ICRP 78. 1997;29.
  11. International Commission on Radiological Protection. Compendium of dose coefficients based on ICRP Publication 60. ICRP 119. 1994;63.
  12. Lee JK. Principles of Radiation Protection. 1st Ed. Seoul, Korea. Korean Association for Radiation Application. 2016;520.
  13. Korea Atomic Energy Research Institute. Measurement and evaluation of internal dose. CR-321:2008;14.
  14. Korea Institute of Nuclear Safety. Basic study development of regulatory standard and guide on internal dosimetry of radiation workers. HR-1409. 2015;7.
  15. Melo D, et al. Harmonization of Internal Dosimetry Procedures in Latin America-ARCAL/IAEA project. Radiat. Prot. Dosim. 2007;127(1-4):325-328. https://doi.org/10.1093/rpd/ncm284