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Temporal distribution of plutonium isotopes in marine sediments off Fukushima after the Fukushima Dai-ichi Nuclear Power Plant accident


The characterization of Pu isotopes in a sediment core collected in the western North Pacific off Fukushima in January 2013 was determined. We compared the results with that of the marine sediments collected from July 2011 to July 2012. Both the 239+240Pu activities and the 240Pu/239Pu atom ratios showed no variation in the marine sediments in the last 2 years since the FDNPP accident. Pu contamination in the marine sediments in the investigated areas still originated from global fallout and the Pacific Proving Ground close-in fallout.

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This work was supported by the Kakenhi Grant-in-aid for Scientific Research on Innovative Areas (24110004), and partly supported by the Agency for Natural Resources and Energy (METI), Japan and the National Natural Science Foundation of China (11275015).

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Correspondence to Jian Zheng or Qiuju Guo.

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Bu, W., Zheng, J., Guo, Q. et al. Temporal distribution of plutonium isotopes in marine sediments off Fukushima after the Fukushima Dai-ichi Nuclear Power Plant accident. J Radioanal Nucl Chem 303, 1151–1154 (2015).

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  • FDNPP accident
  • Plutonium isotopes
  • Marine sediments