Summary of survey

  1. This data was created based on the "Readings of Accumulated Dose outside the 20 km Zone of TEPCO Fukushima Dai-ichi NPP" released to the public in the Monitoring Information of Environmental Radioactivity Level portal site by the Secretariat of the Nuclear Regulation Authority.
  2. The accumulated dose measurements were conducted once or twice per month from April 2011 to January 2014 at the fixed observation points using glass badge dosimeters.
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