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

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• 作者：Katsumi Shozugawa ; Takuya Saito ; Mayumi Hori…
• 关键词：Fukushima accident ; Radiocesium (137Cs ; 134Cs) ; Foodstuffs in Japan ; Concentration treatment
• 刊名：Journal of Radioanalytical and Nuclear Chemistry
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：307
• 期：3
• 页码：2117-2122
• 全文大小：516 KB
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• 作者单位：Katsumi Shozugawa (1)
  Takuya Saito (2)
  Mayumi Hori (1)
  Motoyuki Matsuo (1)
  
  1. Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo, 153-8902, Japan
  2. Akita Radiation Measuring Station (Beguredenega), Katagami, Akita, 018-1400, Japan
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nuclear Chemistry
  Physical Chemistry
  Nuclear Physics, Heavy Ions and Hadrons
  Diagnostic Radiology
  Inorganic Chemistry
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1588-2780

文摘

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).