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.
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