Results of the fourth combined scientific expedition for the radition monitoring in the Kurily-Kamchatka region of the Pacific ocean

This paper continues the series of publications on evaluation of the consequences of the Fukushima-1 nuclear power plant accident and the impact of the emergency radionuclide discharges on the contamination of the sea biota and coastal areas of the Far-East regions. In autumn 2019, the fourth scientific expedition of the Russian geographic society on the monitoring of the radiation situation in Kurily-Kamchatka region was performed on the training vessel «Professor Khlyustin». The expedition included 9 specialists from noncommercial organization «Polar research Fund «Polar Fund», «Russian state hydrometeorological institute», «Radium institute after V.G. Khlopin» of the State Corporation «Rosatom», «Kurchatov institute», «SaintPetersburg research institute of radiation hygiene after prof. P.V. Ramzaev» and «Marine state university after admiral G.I. Nevelsky». The aim of the fourth expedition was to evaluate the radiation situation in the Sea of Japan and Kurily-Kamchatka region after the Fukushima-1 NPP accident as a continuation of the similar marine expeditions in 2011, 2012 and 2014. The survey was performed in the water area of the sea of Japan and Okhotsk sea. The results indicate that the concentration of 137Cs and 90Sr in sea water, hydrobionts, soil, ground and sea vegetation is still on the baseline level due to the global fallouts.

marine expedition, Russian geographic society, Fukushima-1 NPP, radiation accident, radiation situation, 137Cs, 134Cs, 90Sr, 3H, objects of the environment

1. The Fukushima Daiichi Accident Technical Volume 1. Description and Context of the Accident. Vienna: International Atomic Energy Agency (IAEA). 226 p.

2. International Atomic Energy Agency (IAEA). 2015. The Fukushima Daiichi Accident. In: Technical Volume 4. Radiological Consequences. Vienna: International Atomic Energy Agency (IAEA). 250 p.

3. UNSCEAR 2013. Report to the General Assembly with Scientific Annexes. Volume I. Scientific Annex A. United Nations, New York, 2014. 311 p.

4. Romanovich IK, et al. Fukushima-1 NPP accident: management of the prophylactic actions aimed at the preservation of the health of the public in the Russain Federation. Ed. by Academic of RAMS Onischenko G.G. Saint-Petersburg: NIIRG after prov P.V. Ramzaev. 2012: 336 p. (In Russian)

5. Buesseler K, et al. Fukushima Daiichi–derived radionuclides in the ocean: transport, fate, and impacts. Annual review of marine science. 2017;9: 173-203.

6. Sanial V, et al. Unexpected source of Fukushima-derived radiocesium to the coastal ocean of Japan. Proceedings of the National Academy of Sciences. 2017;114(42): 1109211096.

7. Pratama MA, et al. Future projection of radiocesium flux to the ocean from the largest river impacted by Fukushima Daiichi Nuclear Power Plant. Scientific reports. 2015;5: 8408.

8. Arutunyan RV, Bolshov LA, Borovoy AA, Velikhov EP. System analysis of the sources and consequences of Fukishima-1 NPP accident. Institute of the problems of the safe development of the nuclear energy of RAS. Мoscow. 2018: 408. ISBN 978-5-9907220-5-7. (In Russian)

9. Akleev AV, Ivanov V, Sazykina TG, Shinkarev SM. Consequences of the Fucushima-1 NPP accident (overview of the 2013 UNSCEAR report). Meditsinskaya radiologiya i radiatsionnaya bezopasnost = Medical radiology and radiation safety. 2015;60(5): 12-24. (In Russian)

10. Options of utilization of the contaminated water from Fukushima-1 were proposed in Japan. – Available from: http:// fukushima-news.ru/news/v_japonii_predlozhili_varianty_utilizacii_zarazhjonnoj_ vody_s_fukusima_1/2020-01-31-3325 [Accessed 02 March 2020] (In Russian)

11. The Solution of stop the Contaminated Water and The Safety of Fishery Products at TEPCO’s Fukushima Daiichi Nuclear Power Station (provisional translation) Dec. 2019 Fisheries Agency of Japan. – Available from: https://www.jfa.maff. go.jp/e/inspection/attach/pdf/index-94.pdf [Accessed 16 February 2020]

12. High concentration of cesium was determined in fish near “Fukushima”. – Available from: http://fukushima-news.ru/ news/vysokoe_soderzhanie_cezija_obnaruzheno_v_ rybe_ vblizi_ fukusimy/2019-02-06-3281 [Accessed 16 February 2020] (In Russian)

13. Madigan DJ, Baumann Z, Fisher NS. Pacific bluefin tuna transport Fukushima-derived radionuclides from Japan to California. Proceedings of the National Academy of Sciences. 2012;109(24): 9483-9486.

14. Domingo T, et al. Studying levels of Fukushima-derived radioactivity in sockeye salmon collected on the west coast of Vancouver Island. Radiation Physics and Chemistry. 2017;140: 186-189.

15. Cesium from Fukushima found a short way back”. – Available from: http://fukushima-news.ru/news/cezij_s_fukusimy_ nashel_korotkij_put_obratno/2019-07-11-3300 [Accessed 16 February 2020] (In Russian)

16. Nikitin AI, Ramzaev VP, Osokin VM, Sergeev AS, Sevastyanov AV, Aliev RA, et al. Radioecological investigations in the sea of Japan and the North-West part of the Pacific ocean after the accident at the NPP “Fukushima-1” in Japan: preliminary results. Radiatsionnaya Gygiena = Radiation Hygiene. 2011;4(3): 14-35. (In Russian)

17. Biblin AM, Ivanov SA, Ramzaev PV, Basalaeva LN. Some results of the third complex multidisciplinary expedition of the Russian geographical society for monitoring of the radiation situation in the Kuril-Kamchatka area of the Pacific ocean, 2014. Radiatsionnaya Gygiena = Radiation Hygiene. 2015;8(1): 62-66. (In Russian)

18. Ramzaev V, Barkovsky A, Goncharova Yu, Gromov A, Kaduka M, Romanovich I. Radiocesium fallout in the grasslands on Sakhalin, Kunashir and Shikotan islands due to Fukushima accident: the radioactive contamination of soil and plants in 2011. Journal of Environmental Radioactivity. 2013;118: 128-142.

19. Ramzaev VP, Ivanov SA, Goncharova YuN, Vishnyakova NM, Sevastyanov AV. A study of radioactive contamination of marine biota after the Fukushima accident. Radiatsionnaya Gygiena = Radiation Hygiene. 2012;5(4): 5-11. (In Russian)

20. Onischenko GG, Romanovich IK, Barkovsky AN, Bruk GY, Gorsky AA, Stepanov VS. Radiation situation in the far eastern regions of the Russian Federation on the basic of spring and summer surveys in 2011. Radiatsionnaya Gygiena = Radiation Hygiene. 2011;4(3): 7-13. (In Russian)

21. Onishсhenko GG, Repin VS, Romanovich IK. Radiation risks assessment due to consumption of the far east food fish after the accident on “Fukushima-1” NPP. Radiatsionnaya Gygiena = Radiation Hygiene. 2015;8(1): 5-15. (In Russian)

22. Onischenko GG, Romanovich IK, Balonov MI, Barkovsky AN, Gorsky AA. Accident at «Fukushima-1» NPP: First results of emergency response. Report 1: general information about the accident and radiation situation. Radiatsionnaya Gygiena = Radiation Hygiene. 2011;4(2): 5-12. (In Russian)