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High-sensitivity determination of radioactive cesium in Japanese foodstuffs: 3 years after the Fukushima accident

Abstract

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).

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Acknowledgments

Dr. Akira Ishikawa is acknowledged for providing access to the ICP-MS. This work was supported by JSPS KAKENHI Grant Number 25870158.

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Correspondence to Katsumi Shozugawa.

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Shozugawa, K., Saito, T., Hori, M. et al. High-sensitivity determination of radioactive cesium in Japanese foodstuffs: 3 years after the Fukushima accident. J Radioanal Nucl Chem 307, 2117–2122 (2016). https://doi.org/10.1007/s10967-015-4407-8

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  • DOI: https://doi.org/10.1007/s10967-015-4407-8

Keywords

  • Fukushima accident
  • Radiocesium (137Cs, 134Cs)
  • Foodstuffs in Japan
  • Concentration treatment