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Updates
2022.6.24
  The survey results up to May 31, 2022 have been added to the survey results below.
   ・Radioactive Concentration-SeawaterーSeawaterーReinforcement of Monitoring in Fukushima Daiichi Nuclear Power Station Peripheral Sea Area (Seawater)
   ・Radioactive Concentration-SeawaterーResults of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Sea Water)
  The following survey results have been revised.
   ・Radioactive Concentration-Survey of Depth Distribution in SoilーSurvey of Depth Distribution in SoilーDepth Distribution of Radioactive Cesium in Soil Collected Using a Scraper Plate in the Distribution Survey of Radioactive Substances
2022.5.31
  The 2021 survey results have been added to the following survey results.
   ・Air Dose RateーVehicle-borne SurveyーVehicle-borne Survey Conducted by TEPCO
  The 2021 survey results have been added to the following survey results.
   ・Radioactive Concentration-SeawaterーSeawaterーReinforcement of Monitoring in Fukushima Daiichi Nuclear Power Station Peripheral Sea Area (Seawater)
   ・Radioactive Concentration-SeawaterーSeawaterーResults of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Sea Water)
   ・Radioactive Concentration-Marine SoilーResults of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Marine Soil)
   ・Radioactive Concentration-Marine SoilーReinforcement of Monitoring in Fukushima Daiichi Nuclear Power Station Peripheral Sea Area (Marine Soil)
   ・Radioactive Concentration-Marine SoilーResults of Monitoring (Marine Soil) by MOE
  The following survey results have been revised.
   ・Air Dose RateーMonitoring Post and Realtime DosimeterーMeasurement Results of Air Dose Rates Nationwide and in Fukushima Prefecture (Real-time Distribution) Monthly Average
2022.4.28
  The following download data have been revised.
   ・Radioactive Concentration-DepositionーAirborne MonitoringーAirborne Monitoring in the Distribution Survey of Radioactive Substances
    2011～2021
2022.4.8
  The following new contents have been released.
   ・Radioactive Concentration-FoodーFood ItemーReadings of Survey Results of Food in Fukushima Prefecture
   ・Radioactive Concentration-Atmosphere Dust (floating)ーAtmosphere Dust (floating)ーReadings of Atmosphere Dust Sampling by NRA and Fukushima Prefecture
   ・Radioactive Concentration-Game Meat and Marine organismーMarine organismーReadings of the Monitoring on Radioactivity Level in Fisheries Products by Fisheries Agency
  The 2021 survey results have been added to the following survey results.
   ・Air Dose RateーAirborne MonitoringーAirborne Monitoring in the Distribution Survey of Radioactive Substances
   ・Air Dose RateーAirborne MonitoringーUnmanned Helicopter Monitoring in the Distribution Survey of Radioactive Substances
   ・Air Dose RateーVehicle-borne SurveyーVehicle-borne Survey in the Distribution Survey of Radioactive Substances (KURAMA)
   ・Air Dose RateーWalk-borne SurveyーWalk-borne Survey
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーFukushima Prefecture Environmental Radiation Monitoring-Mesh Investigation
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーReadings of Environmental Radiation Monitoring (at Hot springs) in Fukushima Prefecture
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーReadings of Environmental Radiation Monitoring (at Tourist Spots) in Fukushima Prefecture
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーAir Dose Rate Measurements in the Distribution Survey of Radioactive Substances
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーAir Dose Rate Readings out of 20 km Zone of Fukushima Dai-ichi NPP
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーReadings of Accumulated Dose outside the 20 km Zone of TEPCO Fukushima Dai-ichi NPP (Measured by Glass Badge Dosimeter)
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーAir Dose Rate Readings inside the 20 km Zone of Fukushima Dai-ichi NPP
   ・Air Dose RateーSurvey Meter (ambient dose equivalent rate)ーReadings of Accumulated Dose by The Federation of Electric Power Companies of Japan (Member Companies)
   ・Radioactive Concentration-Survey of Depth Distribution in SoilーSurvey of Depth Distribution in SoilーDepth Distribution of Radioactive Cesium in Soil Collected Using a Scraper Plate in the Distribution Survey of Radioactive Substances
   ・Radioactive Concentration-DepositionーIn-situ MeasurementーDeposition of Gamma-Emitting Nuclides in the Distribution Survey of Radioactive Substances
   ・Radioactive Concentration-DepositionーAirborne MonitoringーUnmanned Helicopter Monitoring in the Distribution Survey of Radioactive Substances
   ・Radioactive Concentration-DepositionーAirborne MonitoringーAir-borne Monitoring in the Distribution Survey of Radioactive Substances
   ・Radioactive Concentration-Soil / Environment Sample AnalysisーSoil / Environment Sample AnalysisーResults of the Monitoring of Soil Samples
   ・Radioactive Concentration-Soil / Environment Sample AnalysisーSoil / Environment Sample AnalysisーReadings of Soil Monitoring in 20km Zone of TEPCO Fukushima Dai-ichi NPP
   ・Radioactive Concentration-Soil / Environment Sample AnalysisーSoil / Environment Sample AnalysisーResults of the Monitoring of Environmental Monitoring Samples
   ・Radioactive Concentration-Atmosphere Dust (floating)ーAtmosphere Dust (floating)ーReadings of Dust Sampling in 20km Zone of TEPCO Fukushima Dai-ichi NPP
   ・Radioactive Concentration-Atmosphere Dust (fallout)ーMonthly FalloutーReading of Environmental Radioactivity Level by Prefecture (Monthly Fallout)
   ・Radioactive Concentration-SeawaterーSeawaterーDistribution of Radioactivity Concentration in the Seawater around Fukushima Dai-ichi NPP by TEPCO
   ・Radioactive Concentration-SeawaterーSeawaterーReadings of Sea Area Monitoring (Seawater) by NRA
   ・Radioactive Concentration-Marine SoilーMarine SoilーDistribution of Radioactivity Concentration in the Marine Soil around Fukushima Dai-ichi NPP by TEPCO
   ・Radioactive Concentration-Marine SoilーReadings of Sea Area Monitoring (Marine Soil) by NRA
   ・Radioactive Concentration-Drinking WaterーDrinking WaterーReadings of Radioactivity Level in Drinking Water by Prefecture
2022.2.24
  Added annual download page. You can access it from the annual download button at the top of the page.
2021.12.21
  The following new contents have been released.
   ・Air Dose Rateー Survey Meter (ambient dose equivalent rate) ーLocality data
   ・Radioactive Concentration-River WaterーRiver / Lake WaterーFukushima River Tritium
   ・Radioactive Concentration-Game Meat and Marine organismーGame MeatーRadiation Monitoring Survey Results of Wild Birds and Animals
   ・Radioactive Concentration-Game Meat and Marine organismーMarine organismーMonitoring Results of Aquatic Organisms (Aquatic Organisms - Sea)
  The following survey results have been revised.
   ・Radioactive Concentration-SeawaterーSeawaterーResults of Monitoring (Seawater) by JCG
2021.10.28
  The following survey results have been revised.
   ・Radioactive Concentration-Marine SoilーMarine SoilーReadings of Sea Area Monitoring (Marine Soil) by NRA
2021.10.18
  The following survey results have been released.
   ・Air Dose Rateー Survey Meter (ambient dose equivalent rate) ーResults of the Monitoring Survey in the Restricted Areas and Planned Evacuation Zones（2012.10～2020.10）
  The following survey results have been revised.
   ・Radioactive Concentration-towing monitoringーtowing monitoringーCesium-137 concentration by towing monitoring（Add business id）
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.
   ・Air Dose RateーVehicle-borne SurveyーVehicle-borne Survey Conducted by TEPCO（2020.11）
   ・Air Dose RateーAirborne MonitoringーUnmanned Helicopter Monitoring in the Distribution Survey of Radioactive Substances （2017～2020）
   ・Air Dose RateーAirborne MonitoringーAirborne Monitoring in the Distribution Survey of Radioactive Substances（2018～2020）
   ・Air Dose RateーBackgroundーBackground Map
   ・Air Dose RateーMonitoring Post and Realtime DosimeterーMeasurement Results of Air Dose Rates Nationwide and in Fukushima Prefecture (Real-time Distribution) Monthly Average
   ・Radioactive Concentration-SeawaterーSeawaterーReadings of Sea Area Monitoring (Seawater) by NRA（2020.7～2020.10）
   ・Radioactive Concentration-SeawaterーSeawaterーResults of Monitoring (Seawater) by JCG（2020.5～2020.10）
   ・Radioactive Concentration-Marine SoilーMarine SoilーResults of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Marine Soil)（2020.3）
   ・Radioactive Concentration-Marine SoilーMarine SoilーReinforcement of Monitoring in Fukushima Daiichi Nuclear Power Station Peripheral Sea Area (Marine Soil)（2020.2～2020.3）
   ・Radioactive Concentration-Marine SoilーMarine SoilーResults of Monitoring (Marine Soil) by MOE（2018.6～2019.7）
   ・Radioactive Concentration-Marine SoilーMarine SoilーDistribution of Radioactivity Concentration in the Seawater around Fukushima Dai-ichi NPP by TEPCO.（2020.1～2021.12）
   ・Radioactive Concentration-Marine SoilーMarine SoilーReadings of Sea Area Monitoring (Marine Soil) by NRA（2020.1～2020.10）
   ・Radioactive Concentration-Marine SoilーMarine SoilーMonitoring Results of Sediment in Public Water Areas by MOE（2019.5～2020.3）
   ・Radioactive Concentration-Marine SoilーMarine SoilーReadings of Sea Area Monitoring (Marine Soil) by JCG（2011.6～2017.12）
  The following survey results have been revised.
   ・Radioactive Concentration-SeawaterーSeawaterーResults of Monitoring (Seawater) by JCG（2011.8～2019.12）
   ・Radioactive Concentration-Marine SoilーMarine SoilーResults of Environmental Radioactivity Monitoring by Fukushima Prefecture (Ports and Sea Surface Fishing Ground) (Marine Soil)（2011.5～2020.1）
   ・Radioactive Concentration-Marine SoilーMarine SoilーReinforcement of Monitoring in Fukushima Daiichi Nuclear Power Station Peripheral Sea Area (Marine Soil)（2018.6～2019.7）
   ・Radioactive Concentration-Marine SoilーMarine Soilー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.
   ・Air Dose RateーAirborne MonitoringーUnmanned Helicopter Monitoring in the Distribution Survey of Radioactive Substances.
  1 survey results were updated.
   ・Air Dose RateーWalk-borne Surveyー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…

Measured data of the radioactive cesium on the bottom of the sea by ship towing monitoring.
Measured data of th…

Data of radioactive substances measured to maintain our safety and security of food including agricultural products, livestock products, fishery products, and processed food.
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.