Summary of survey

  1. This data was created based on measurements within a 20 km radius of TEPCO Fukushima Dai-ichi NPP, available in the Monitoring Information of Environmental Radioactivity Level, the portal site run by Nuclear Regulation Authority.
  2. Measurements were conducted every week from March 2011.
  3. Dosimeters which were used: NaI (NaI scintillator detector) and IC (ionization chamber type survey meter).
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