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Sergey Shinkarev

Burnasyan Federal Medical Biophysical Center. Comparative analysis of the radionuclide composition in fallout after the Chernobyl and the Fukushima accidents. Sergey Shinkarev. Tasks. Chernobyl and Fukushima

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Sergey Shinkarev

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  1. Burnasyan Federal Medical Biophysical Center Comparative analysis of the radionuclide composition in fallout after the Chernobyl and the Fukushima accidents Sergey Shinkarev

  2. Tasks Chernobyl and Fukushima Analysis of the ratios of q(Ri)/q(137Cs) decay-corrected to the date of the main fallout. [q(Ri) is ground deposition density of radionuclide Ri] Analysis of the dependence of q(131I)/q(137Cs) vs q(137Cs) decay-corrected to the date of the main fallout.

  3. Areas considered Chernobyl Near zone – Central spot (up to 60 km) Far zone – Gomel-Mogilev spot (centered ~200 km) Fukushima Near zone – circle (up to ~60 km)

  4. Chernobyl: Map of 137Cs deposition

  5. Fukushima: Map of 137Cs deposition

  6. Input data Chernobyl Spectometrical measurements of soil samples. For 131I – only measurements conducted up to 2 months following accidents (up to June 23, 1986). Units – kBq m-2 Measurements were carried out by the specialists from: Institute of Nuclear energy (Minsk, Belarus) and Institute of Biophysics (Moscow, Russia)

  7. Input data Fukushima Spectometrical measurements of soil samples. For 131I – only measurements conducted up to 2.5 months following accidents (up to May 31, 2011). Units – Bq kg-1 Measurements were carried out by Japanese specialists and placed at the website of MEXT (Ministry of Education, Culture, Sports, Science and Technology)

  8. Task Chernobyl and Fukushima Analysis of the ratios of q(Ri)/q(137Cs) decay-corrected to the date of the main fallout. [q(Ri) is ground deposition density of radionuclide Ri]

  9. Average ratio of Ri to 137Cs in soil

  10. Range of ratio of 131I/137Cs in soil Chernobyl (two spots) 131I/137Cs = 3-50 Fukushima (near zone) 131I/137Cs = 5-80

  11. Task Chernobyl and Fukushima Analysis of the dependence of q(131I)/q(137Cs) vs q(137Cs) decay-corrected to the date of the main fallout.

  12. Chernobyl: Central spot

  13. Chernobyl: Gomel-Mogilev spot

  14. Fukushima: 24 km north

  15. Fukushima: 33 km north-west

  16. Fukushima: 62km north-west

  17. Fukushima: 30km west-northwest

  18. Fukushima: 32km west

  19. Fukushima: 22 km west-southwest

  20. Fukushima: 23 km south

  21. Discussion Deposition velocity 131I aerosols, Vg ~ 1 mm s-1; reactive gaseous (elemental iodine), Vg ~ 10 mm s-1; non-reactive gaseous (organic compounds), Vg ~ 0.1 mm s-1. 137Cs aerosols, Vg ~ 1 mm s-1. Scavenging processes from the air to the ground Wet deposition Dry deposition

  22. Conclusions • Fukushima – volatile and intermediate (I, Cs, Te) Chernobyl – all radionuclides (I, Cs, Te, Ru, Ba(La), Zr(Nb), Ce) • Fukushima and Chernobyl fallout – 131I/137Cs decreases with increase of level of the 137Cs ground deposition • Revealed tendency can be used in dose reconstruction

  23. Thank you for your attention

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