High-sensitivity determination of radioactive cesium in Japanese foodstuffs: 3 years after the Fukushima accident
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We analyzed 134Cs, 137Cs and 40K in 96 foodstuffs in supermarkets with high sensitivity over 3 years after Fukushima accident. Milk, yoghurt, rice, tea, salmon, cereal, blueberry, miso, and apples had a trace of 134Cs and 137Cs from 10−3 to 100 Bq/kg, however, some mushrooms that were bought in the outer Fukushima prefecture were contaminated by radioactive cesium over the regulatory limit (100 Bq/kg). In view of the 134Cs/137Cs radioactivity ratio, we can conclude that 137Cs detected in remote areas 300 km or more from Fukushima Nuclear power plant contained activity from Pre-Fukushima events such as Chernobyl accident (1986) and atmospheric nuclear explosions (from 1945).
KeywordsFukushima accident Radiocesium (137Cs, 134Cs) Foodstuffs in Japan Concentration treatment
Dr. Akira Ishikawa is acknowledged for providing access to the ICP-MS. This work was supported by JSPS KAKENHI Grant Number 25870158.
- 3.Chino M, Nakayama H, Nagai H, Terada H, Katata G, Yamazawa H (2011) Preliminary estimation of release amounts of 131I and137Cs Accidentally Discharged from the Fukushima Daiichi Nuclear Power Plant into the atmosphere. J Nucl Sci Technol 48(7):1129–1134. doi: 10.1080/18811248.2011.9711799 CrossRefGoogle Scholar
- 6.Winiarek V, Bocquet M, Saunier O, Mathieu A (2012) Estimation of errors in the inverse modeling of accidental release of atmospheric pollutant: application to the reconstruction of the cesium-137 and iodine-131 source terms from the Fukushima Daiichi power plant. J Geophys Res. doi: 10.1029/2011jd016932 Google Scholar
- 7.Stohl A, Seibert P, Wotawa G, Arnold D, Burkhart JF, Eckhardt S, Tapia C, Vargas A, Yasunari TJ (2012) Xenon-133 and caesium-137 releases into the atmosphere from the Fukushima Dai-ichi nuclear power plant: determination of the source term, atmospheric dispersion, and deposition. Atmos Chem Phys 12(5):2313–2343. doi: 10.5194/acp-12-2313-2012 CrossRefGoogle Scholar
- 10.Fukushima Association for Securing Safety of Agricultural Products. https://fukumegu.org/ok/kome/
- 12.Ministry of Health LaW, Japan (2013) National Health and Nutrition SurveyGoogle Scholar
- 14.Ministry of Education C, Sports, Science and Technology (MEXT), Japan (1982) The guideline of sample pre-treatment for Ge semiconductor defector. vol 14 (in Japanese)Google Scholar
- 15.ICRP (1995) Age-dependent doses to the members of the public from intake of radionuclides—part 5 compilation of ingestion and inhalation coefficients (Publication 72). vol 26Google Scholar
- 16.Ministry of Health LaW, Japan (2014) The results of surveys on the levels of radioactive cesium in foods (February–March 2014); 1% or below the current regulatory dose limit of 1 millisieverts per year (in Japanese)Google Scholar