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Contribution of 137Cs-enriched particles to radiocesium concentrations in seafloor sediment: Reconnaissance experiment

Nuclear Regulation Authority (April 2013?present). 9 / 11 Author Contributions Conceptualization: Takahito Ikenoue, Nobuyoshi Ishii. Data curation: Takahito Ikenoue, Hyoe Takata. Formal analysis ... : Takahito Ikenoue, Nobuyoshi Ishii. Investigation: Takahito Ikenoue. Methodology: Takahito Ikenoue, Nobuyoshi Ishii. Project administration: Takahito Ikenoue, Hyoe Takata. Supervision: Takahito Ikenoue

Decline in radiocesium in seafloor sediments off Fukushima and nearby prefectures

Radioactivity has been monitored in seafloor sediments off Fukushima and nearby prefectures regularly. During the initial monitoring period (May–September 2011), 137Cs concentrations in the surface sediments (0–3 cm) generally increased to 8–580 Bq/kg. Subsequently, concentrations decreased at variable rates. In the latest data, from February 2016, concentrations were still...

Temporal variation of cesium isotope concentrations and atom ratios in zooplankton in the Pacific off the east coast of Japan

After the Fukushima Daiichi Nuclear Power Plant accident in March 2011, concentrations of cesium isotopes (133Cs, 134Cs, and 137Cs) were measured in zooplankton collected in the Pacific off the east coast of Japan from May 2012 to February 2015. The time series of the data exhibited sporadic 137Cs concentration peaks in zooplankton. In addition, the atom ratio of 137Cs/133Cs in...