Recirculation of FNPP1-derived radiocaesium observed in winter 2015/2016 in coastal regions of Japan

Michio Aoyama; Yasunori Hamajima; Yayoi Inomata; Eitarou Oka

doi:10.1016/j.apradiso.2016.12.003

Recirculation of FNPP1-derived radiocaesium observed in winter 2015/2016 in coastal regions of Japan

Appl Radiat Isot. 2017 Aug:126:83-87. doi: 10.1016/j.apradiso.2016.12.003. Epub 2016 Dec 18.

Authors

Michio Aoyama¹, Yasunori Hamajima², Yayoi Inomata³, Eitarou Oka⁴

Affiliations

¹ Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan. Electronic address: r706@ipc.fukushima-u.ac.jp.
² Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan. Electronic address: hamajima@se.kanazawa-u.ac.jp.
³ Institute of Nature and Environmental Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan. Electronic address: yinomata@se.kanazawa-u.ac.jp.
⁴ Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan. Electronic address: eoka@aori.u-tokyo.ac.jp.

PMID: 28017501
DOI: 10.1016/j.apradiso.2016.12.003

Abstract

We conducted enhanced surface water sampling at more than 80 stations in coastal regions on both the Japan Sea and Pacific Ocean sides of Japan in winter 2015/2016 to examine the recirculation behaviour of FNPP1-derived radiocaesium in the surface layer 5 years after the 2011 FNPP1 accident. We found that a small part of the FNPP1-derived radiocaesium had already recirculated in the surface layer and reached the Japanese coast.

Keywords: Fukushima Dai-ichi Nuclear power plant accident; Global fallout; Radiocaesium; Recirculation.

MeSH terms

Cesium Radioisotopes / analysis*
Fukushima Nuclear Accident*
Humans
Japan
Pacific Ocean
Seasons
Seawater / analysis*
Time Factors
Water Pollutants, Radioactive / analysis*

Substances

Cesium Radioisotopes
Water Pollutants, Radioactive
Cesium-137
Cesium-134