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BOOKLET to Provide Basic Information Regarding Health Effects of Radiation (1st Edition)
Chapter 7 Environmental Monitoring 7.1 Spatiotemporal Distribution of Ambient Dose Rates

Distribution of Ambient Dose Rates within the 80-km Zone of Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi NPS

Distribution of Ambient Dose Rates within the 80-km Zone of Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi NPS_Figure

In order to ascertain the changes in the effect of radioactive materials, the airborne monitoring survey has been conducted continuously within the 80-km zone of TEPCO's Fukushima Daiichi NPS, and the distribution of ambient dose rates and deposition of radioactive cesium have been surveyed. Additionally, the effect of radioactive materials outside the 80-km zone has also been ascertained through the airborne monitoring survey.

It was confirmed that ambient dose rates within the 80-km zone decreased over time both in areas showing higher dose rates (areas extending to the northwest of the NPS) and areas showing lower dose rates.

  • Included in this reference material on March 31, 2014
  • Updated on February 28, 2018
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