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Language: Japanese
Database - Miscellaneous
The terms and conditions for using this database function of the Environmental Radiation Data Search Site (RAMDAS) after the Great East Japan Earthquake are as follows. "User" refers to a person who uses this database function, and "Map" refers to map information created through this database function from monitoring data measured or published by the national or local government, research institutes, etc., using geographic information or software of the Geospatial Information Authority of Japan map operated by the Geospatial Information Authority of Japan, Ministry of Land, Infrastructure, Transport and Tourism.
  • The map provided by this database function uses Geospatial Information Authority of Japan maps to provide information on the impact of radioactive materials that were released from the Fukushima Daiichi Nuclear Power Station and deposited on the ground surface. Please use this database function in accordance with the Geospatial Information Authority of Japan Content Terms of Use.
  • When using this database function, you must not damage or infringe on the property rights, including personal rights, of those who hold copyrights and other rights.
  • When quoting the maps provided by this database function in other materials, please be sure to clearly indicate that the source is "Environmental Radiation Monitoring Information Site since the Great East Japan Earthquake / Geospatial Information Authority of Japan Maps."
  • Users must observe the Rules and Manners for Internet Users (Internet Association, a general incorporated foundation). It is strictly prohibited to transmit any information that constitutes social or legal responsibility as outlined in the Rules and Manners.
  • The content of this database function may be changed or deleted without notice, or this database function may be suspended for maintenance.
  • Depending on the measurement data, it may take some time to process the display.
  • If you have problems such as "no response when pressing the button" or "an error occurs," please check the FAQ.
  • Please refer here for the prefecture and city/ward/town/village codes used in the data of this database function.
    Source: National Land Numerical Information (Administrative District Data), Ministry of Land, Infrastructure, Transport and Tourism [ ] (Reference date: November 25, 2020)
  • For the population information used in the data of this database function, please refer here.
    Source: National Land Numerical Information – Future Estimated Population Data by 1km Mesh (H30 National Political Bureau Estimate), Ministry of Land, Infrastructure, Transport and Tourism [ ] (Reference date: September 13, 2021)
  • This database function collects the results of air dose measurements in Fukushima Prefecture and neighboring prefectures due to the Fukushima Daiichi Nuclear Power Station accident, and the analysis results of radioactive material concentrations in land soil (soil surface and underground), marine areas (seawater, marine sediments), rivers (river water, riverbed sediments), groundwater, and food (agricultural, forestry, livestock, fishery products, etc.). Since newly released data is collected periodically, the values published in this database function may differ from those published by each organization in cases where the organizations that carried out the measurements have revised the measurements to more appropriate values.