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BOOKLET to Provide Basic Information Regarding Health Effects of Radiation (4th edition)
Chapter 7 Environmental Radiation Monitoring 7.8 Radiation Monitoring of Ocean

Radioactivity Concentrations in Seawater and Sea-bottom Soil (FY2011)

Radioactivity Concentrations in Seawater and Sea-bottom Soil (FY2011)_Figure

Since October 2011, radiation monitoring of radioactive cesium (Cs-137) in seawater and sea-bottom soil has been conducted jointly by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) (until the establishment of the Secretariat of the Nuclear Regulation Authority), Secretariat of the Nuclear Regulation Authority, Fisheries Agency, Japan Coast Guard, Ministry of the Environment (MOE), Fukushima Prefecture and Tokyo Electric Power Company (TEPCO). With regard to samples collected near outlets (at Measuring Points T-1 and T-2), analysis has been conducted not only for radioactive cesium, but also for radioactive iodine (only for seawater samples), radioactive strontium, plutonium, and tritium (only for seawater samples).

The figures show the results of radiation monitoring of the sea area immediately after the accident.

  • Included in this reference material on March 31, 2013
  • Updated on March 31, 2019
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