Summary of survey

  1. This data was created based on the daily fallout monitoring results by prefectures from March 2011 to December 2011 in the "Reading of Environmental Radioactivity Level by Prefecture (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 fallout substances were collected with a precipitation collector and measured using a germanium semiconductor detector.
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