Summary of survey

  1. This data was created based on the "Reading of Environmental Radioactivity Level by Prefecture (Monthly Fallout)" released to the public in the Monitoring Information of Environmental Radioactivity Level portal site by the Secretariat of the Nuclear Regulation Authority.
  2. The data includes measured data from February 2011.
  3. The Secretariat of the Nuclear Regulation Authority compiled the data reported from each prefecture government and released in the website.
  4. The one-month accumulated fallout substances were measured every month.
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