It may take longer time to display car surveys, walk surveys, and airborne surveys due to the large number of the registered data.
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Maintenance will be performed during the following hours to update the data.
The site will not be available during maintenance.
Period: October 18, 2021 9: 00-15: 00 (plan)
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Updates
2021.10.4-5
  Retrieval time was improved.
2021.10.1
  The following new contents have been released.
   ・Radioactive Concentration-Deposition
   ・Radioactive Concentration-Soil / Environment Sample Analysis
   ・Radioactive Concentration-Atmosphere Dust (floating)
   ・Radioactive Concentration-Atmosphere Dust (fallout)
   ・Radioactive Concentration-River Water
   ・Radioactive Concentration-River Soil
   ・Radioactive Concentration-Drinking Water
   ・Radioactive Concentration-Game Meat and Marine organism
   ・Radioactive Concentration-towing monitoring
  The following survey results have been released.
   ・Survey Results of Vehicle-borne Survey Conducted by TEPCO　（2020.11）
   ・Survey Results of Unmanned Helicopter Monitoring in the Distribution Survey of Radioactive Substances （2017～2020）
   ・Survey Results of Airborne Monitoring in the Distribution Survey of Radioactive Substances（2018～2020）
   ・Survey Results of Background Map
   ・Survey Results of Measurement Results of Air Dose Rates Nationwide and in Fukushima Prefecture (Real-time Distribution) Monthly Average.
   ・Survey Results of Readings of Sea Area Monitoring (Seawater) by NRA（2020.7～2020.10）
   ・Survey Results of Results of Monitoring (Seawater) by JCG（2020.5～2020.10）
   ・Survey Results of Results of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Marine Soil)（2020/3）
   ・Survey Results of Results of Monitoring (Marine Soil) by MOE（2018/6～2019/7）
   ・Survey Results of Results of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Marine Soil)（2020.2～2020.3）
   ・Survey Results of Distribution of Radioactivity Concentration in the Seawater around Fukushima Dai-ichi NPP by TEPCO.（2020.1～2021.12）
   ・Survey Results of Monitoring Results of Sediment in Public Water Areas by MOE（2019.5～2020.3）
   ・Survey Results of Readings of Sea Area Monitoring (Marine Soil) by JCG（2011.6～2017.12）
  The following survey results have been revised.
   ・Survey Results of Results of Monitoring (Seawater) by JCG（2011.8～2019.12）
   ・Survey Results of Results of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Marine Soil)（2011.5～2020.1）
   ・Survey Resu lts of Reinforcement of Monitoring in Fukushima Daiichi Nuclear Power Station Peripheral Sea Area (Marine Soil)（2018.6～2019.7）
   ・Survey Results of Results of Monitoring (Marine Soil) by MOE（2011.6～2017.12）
2021.7.12
 Improved the top page design.
 Improved the display speed of each content.
2021.5.26
  1 survey results were released.
   ・Survey Results of Unmanned Helicopter Monitoring in the Distribution Survey of Radioactive Substances.
  1 survey results were updated.
   ・Walk-borne Survey（2020.10）
  Airborne Monitoring in the Distribution Survey of Radioactive Substances download data was corrected.
   ・Corrected the names of cities, wards, towns and villages in the download data of 1st to 5th (2011.4 to 2012.6) and 7th (2013.9) survey.
2021.3.31
  Open test.
Favorite data
Measured air dose rate data, i.e. the amount of radiation per unit time in the air (Air absorbed dose rates[nGy/h], or ambient dose equivalent rate[μSv/h]). The air dose rate is continuously observed around the nuclear facilities to detect abnormality including radioactive substances leakage.
Measured air dose r…

In order to confirm the condition in the depth distribution of radioactive cesium comprehensively mainly within a 80 km radius of the Fukushima Dai-ichi NPP, we collected soil samples at various depths using a scraper plate which is the standard method to measure radioactive nuclides in soil profiles employed at IAEA and researched the depth distribution of radioactive cesium.
In order to confirm…

Measured data of radioactive substances released to the environment by Fukushima Daiichi NPP accident in seawater.
Measured data of ra…

Measured data of radioactive substances released to the environment by Fukushima Daiichi NPP accident in marine soil.
Measured data of ra…

Measured data of radioactive concentration deposited on the surface soil after TEPCO's FDNPP accident.
Measured data of ra…

Measured data of radioactive substances released to the environment by Fukushima Daiichi NPP accident including ground deposition, radioactive concentration of soil sample and environmental sample, and radioactive substance depth distribution.
Measured data of ra…

Measured data of radioactive substances in the Atomosphere Dust (floating).
Measured data of ra…

Measured data of radioactive substances in the Atmosphere Dust (fallout) and rainfall.
Measured data of ra…

Measured data of radioactive substances in the water including river water and lake water.
Measured data of ra…

Measured data of River Bottom Sediment Quality, Environment around the river, and Rivers Suspended Sediment.
Measured data of Ri…

Data of radioactive substances measured to maintain our safety and security of drinking water.
Data of radioactive…

Data of radioactive substances measured to maintain our safety and security of Wild Birds and Animals.
Data of radioactive…

This is the Database for Radioactive Substance Monitoring Data renewed and released on October 1, 2021. Click here for the old site.