August 2023 to May 2025
(outside 3km area)
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This website allows users to unitarily observe results obtained from integration of sea area monitoring data in reports published by various organizations.
Please go to this link for international and national guidance levels of each radioactive isotope.
Carefully read and agree to the Terms of Use before using the website.
Announcement
- March 24, 2025
The video showing the changes of tritium concentration in seawater sampled in the sea-area of Fukushima Prefecture has been released. - February 5, 2025
Seawater monitoring data collected along and off the coast of Fukushima Prefecture by Fukushima Prefecture has been added. - November 1, 2024
Monitoring data on cesium, iodine, and tritium in seaweed collected along the coast of Fukushima by Fukushima Prefecture, Government of Japan (the Ministry of the Environment and the Fisheries Agency) and Tokyo Electric Power Company Holdings has been published. - June 21, 2024
Monitoring data regarding cesium and tritium levels in seawater collected along and off the coast of Fukushima Prefecture by Fukushima Prefecture are added. - January 12, 2024
Chinese (Simplified), Chinese (Traditional/Taiwan), Chinese (Traditional/Hong Kong), and Korean pages are now available. - January 12, 2024
Monitoring data regarding tritium levels in fish body collected along the coast of Fukushima Prefecture by Fisheries Agency of Japan, are now available. - September 19, 2023
Quickly measured data are now available. - August 30, 2023
Results of quick measurements Here. - August 21, 2023
Monitoring data regarding cesium and tritium levels in fish body collected along and off the coast of Fukushima Prefecture by Fukushima Prefecture, the Ministry of the Environment, Government of Japan, the Nuclear Regulation Authority, Japan, and Tokyo Electric Power Company Holdings, Incorporated, are now available. In addition, monitoring data regarding cesium and tritium levels in seawater collected along and off the coast of Fukushima Prefecture by the Prefecture, the Ministry of the Environment, Government of Japan, and Tokyo Electric Power Company Holdings, Incorporated, are updated. - March 13, 2023
Monitoring data regarding cesium and tritium levels in seawater collected along and off the coast of Fukushima Prefecture by the Prefecture, the Ministry of the Environment and the Nuclear Regulation Authority, Japan and Tokyo Electric Power Company Holdings, Incorporated, Japan are now available.
