Verification of model of external population exposure in Japan after the accident at the “Fukushima-1” NPP
https://doi.org/10.21514/1998-426X-2020-13-2-31-40
Abstract
The paper is devoted to the verification of the model of external exposure of the Japanese population from radioactive fallout after the accident at the “Fukushima-1” NPP published by UNSCEAR in 2014. The paper presents specific quantitative examples of the verification of the external exposure model of the Japanese population after the accident at the “Fukushima-1” nuclear power plant. As an independent set of experimental data for validation of the model estimates we used the results of measurements of individual doses of external radiation in various population groups in Japan in different time periods after fallout. In the case of the deterministic version of the model, it was shown that for the adult population working mainly outdoors (construction workers and agricultural workers), the differences between the average values of effective doses predicted by the model and those obtained on the basis of measurements were less than 20%. For office workers, this difference was larger, from 34 to 70%, depending on whether their office buildings are wooden or multi-story concrete. For children under 16 years of age and a longer period of time for measuring individual doses after radioactive fallout (2011 – 2015), the differences between the model average effective doses and those estimated on the basis of measurements ranged from –24% to +32% in different time periods. In the case of the stochastic version of the model, it was shown that for the three considered groups of the adult population the distributions of individual doses obey the logarithmically normal law and the differences in the values of the calculated and experimental geometric means ranged from –7% to +20%. The geometric standard deviation values obtained in the simulation were always slightly higher than the similar values estimated based on the measurement results.
About the Author
V. Yu. Golikov
Saint-Petersburg Research Institute of Radiation Hygiene after Professor P.V. Ramzaev, Federal Service for Surveillance on Consumer Rights Protection and Human Well-Being
Russian Federation
Russian Federation
Vladislav Yu. Golikov – Senior Researcher of the Medical Protection Laboratory
Mira Str., 8, Saint-Petersburg, 197101
References
1. WHO – World Health Organization. Preliminary dose estimation from the nuclear accident after the 2011 Great East Japan earthquake and tsunami. World Health Organization, Geneva, 2012.
2. UNSCEAR – United Nations Scientific Committee on the Effects of Atomic Radiation. UNSCEAR 2013 Report, Vol. 1, Scientific Annex A, Levels and Effects of Radiation Exposure due to the Nuclear Accident after the 2011 Great East-Japan Earthquake and Tsunami, Appendix C (Assessment of Doses to the Public). United Nations, New York, 2014.
3. Golikov V, Balonov M, Erkin V, Jacob P. Model validation for external doses due to environmental contaminations by the Chernobyl accident. Health Phys. 1999;77(6): 654-661.
4. Golikov VYu. Analysis of the long-term dynamics of external doses of the population after the Chernobyl accident. Radiatsionnaya Gygiena = Radiation Hygiene. 2018; 11(4): 39-50.
5. Petoussi-Henss NH, Schlattl H, Zankl M, Endo A, Saito K. Organ doses from environmental exposures calculated using voxel phantoms of adults and children. Phys. Med. Biol. 2012;57: 5679–5713.
6. Golikov V, Wallstrom E, Wohni T, Tanaka K, Endo S, Hoshi M. Evaluation of conversion coefficients from measurable to risk quantities for external exposure over contaminated soil by use of physical human phantoms. Radiat Environ Biophys. 2007;46(4): 375-382.
7. Saito K, Petoussi-Henss N. Ambient dose equivalent conversion coefficients for radionuclides exponentially distributed in the ground, Journal of Nuclear Science and Technology. 2014;51(10): 1274-1287. DOI: 10.1080/00223131.2014.919885.
8. Jacob P, Pröhl G, Likhtarev I, Kovgan L, Gluvchinsky R, Perevoznikov O, et al. Pathway analysis and dose distributions. European Commission, Brussels: EUR 16541 EN: 1-130; 1996.
9. Golikov VYu, Balonov MI, Jacob P. External Exposure of the Population Living in Areas of Russia Contaminated due to the Chernobyl Accident. Radiat. Environ. Biophysics, 2002;41(10): 185-193.
10. Sanada Y, Urabe Y, Sasaki M, Ochi K, Torii T. Evaluation of ecological half-life of dose rate based on airborne radiation monitoring following the Fukushima Dai-ichi nuclear power plant accident. Journal of Environmental Radioactivity. 2018;192: 417-425 https://doi.org/10.1016/j.jenvrad.2018.09.014.
11. Mikami S, Maeyama T, Hoshide Y, Sakamoto R, Sato S, Okuda N, et al. The air dose rate around the Fukushima Daiichi Nuclear Power Plant: its spatial characteristics and temporal changes until December 2012. J. Environ. Radioact. 2015;139: 250-259.
12. Mikami S, Tanaka H, Matsuda H, Sato S, Hoshide Y, Okuda N, et al. The deposition densities of radiocesium and the air dose rates in undisturbed fields around the Fukushima Dai-ichi nuclear power plant; their temporal changes for five years after the accident. Journal of Environmental Radioactivity. 2019; 210: 105941 https://doi.org/10.1016/j.jenvrad.2019.03.017.
13. International Commission on Radiation Units and Measurements, 1994. Gamma ray spectrometry in the environment. ICRU Report 53.
14. IAEA (International Atomic Energy Agency), 2000. Generic Procedures for Assessment and Response during a Radiological Emergency (IAEA-TECDOC-1162).
15. Jacob P, Meckbach R, Müller H.M. Reduction of external exposure from deposited Chernobyl activity by run-off, weathering, street cleaning and migration in the soil. Radiat. Prot. Dosim. 1987; 21: 51-57.
16. Kamada N, Saito O, Endo S, Kimura A, Shizuma K. Radiation doses among residents living 37 km northwest of the Fukushima Dai-ichi nuclear power plant. J. Environ. Radioact. 2012;110: 84–89.
17. Yoshida-Ohuchi H, Hosoda M, Kanagami T, Uegaki M, Tashima H. Reduction factors for wooden house due to external γ-radiation based on in situ measurements after the Fukushima nuclear accident. Sci. Rep. 2014;4(7541): 1–6.
18. Matsuda N, Mikami S, Sato T, Saito K. Measurements of air dose rates in and around houses in the Fukushima Prefecture in Japan after the Fukushima accident. J. Environ. Radioact. 2016;166(Part3): 427–435.
19. Yoshida-Ohuchi H, Matsuda N, Saito K. Review of reduction factors by buildings for gamma radiation from radio-caesium deposited on the ground due to fallout. Journal of Environmental Radioactivity. 2019; 187: 32-39. https://doi.org/10.1016/j.jenvrad.2018.02.006
20. Radiation monitoring and dose estimation of the Fukushima Nuclear Accident. Editor Takahashi S. 2014. ISBN 978-4-431-54582-8. DOI 10.1007/978-4-431-54583-5.
21. Takahara S, Abe T, Iijima M, Shimada K, Shiratori Y. Statistical characterization of radiation doses from external exposures and relevant contributors in Fukushima prefecture. Health Phys. 2014; 107(4): 326-335.
22. Takahara S, Iijima M, Yoneda M, Shimada Y. A probabilistic approach to assess external doses to the Public considering spatial variability of radioactive contamination and inter population differences in behavior pattern. Risk Anal 2017; 39(1): 212-224. https://doi.org/10.1111/risa.12900
23. ICRP, 1996. Conversion coefficients for use in radiological protection against external radiation. ICRP Publication 74. Ann. ICRP 26(3/4).
24. Tsubokura M, Murakami M, Nomura S, Morita T, Nishikawa Y, Leppold C, et al. Individual external doses below the lowest reference level of 1 mSv per year five years after the 2011 Fukushima nuclear accident among all children in Soma City, Fukushima: A retrospective observational study. PLoS ONE. 2017; 12(2): e0172305. doi:10.1371/journal.pone.0172305
25. Golikov VYu. Dosimetry of external population exposure: a comparison of the Chernobyl and Fukushima accidents. Radiatsionnaya Gygiena = Radiation Hygiene. 2020;13(1): 27-37. DOI: 10.21514/1998-426X-2020-13-1-27-37 (In Russian).
26. The data about activity per unit area of Cs-137 and Cs-134 were extracted from: http://www.mext.go.jp/b_menu/shingi/chousa/gijyutu/017/shiryo/__icsFiles/afield-file/2011/09/02/1310688_1.pdf (Accessed May 25, 2020).
27. IAEA (1989) Evaluating the reliability of predictions made using environmental transfer models. IAEA Safety Series 100. International Atomic Energy Agency, Vienna
28. Golikov V, Balonov M, Erkin V, Jacob P. Model validation for external doses due to environmental contaminations by the Chernobyl accident. Health Phys. 1999;77(6): 654-661.
29. ICRP, 2006a. Assessing dose of the representative person for the purpose of radiation protection of the public and the optimization of radiological protection: Broadening the process. ICRP Publication 101. Ann. ICRP 36(3).
30. Oracle Crystal Ball. – Available on: http://www.oracle.com/crystalball (Accessed May 25, 2020).
31. Developments since the 2013 UNSCEAR report on the levels and effects of radiation exposure due to the nuclear accident following the Great East-Japan earthquake and tsunami. A 2017 white paper to guide the Scientific Committee’s future programme of work. New York, 2017.
Review
For citations:
Golikov V.Yu. Verification of model of external population exposure in Japan after the accident at the “Fukushima-1” NPP. Radiatsionnaya Gygiena = Radiation Hygiene. 2020;13(2):31-40. (In Russ.) https://doi.org/10.21514/1998-426X-2020-13-2-31-40
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