Summary of survey

Based on "Implementation Guides on Sea Area Monitoring in FY2013", the Secretariat of the Nuclear Regulation Authority conducts sea area monitoring to figure out dispersion, deposition and migration of radioactive substances released into the environment. Measurements of sea water in Tokyo bay, offshore (30 - 90 km from coastal line) of Miyagi Prefecture, Fukushima Prefecture and Chiba Prefecture, and outer sea (90 - 280 km from costal line and sea area further than 280 km) are conducted considering continuity with past monitoring. The data here was created based on the results of measurement.Measurement period of the KML file is from May 2013 to November 2014 .
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