Database for Radioactive Substance Monitoring Data

Japan Atomic Energy Agency (JAEA) collects and discloses the results of measurement of air dose rates in Fukushima Prefecture and neighboring prefectures due to the accident at TEPCO's Fukushima Daiichi NPP, which are disclosed by the Nuclear Regulation Authority and Fukushima Prefecture, etc., as well as the results of analysis of radioactive materials in land soil (soil surface and in soil), sea area (sea water, sea bottom soil), rivers (river water, river bottom soil) and underground water, food (agricultural, forestry, livestock, marine products, etc.). The results are made public so that users can intuitively grasp the situation by visualizing the large volume of data.


Air Dose Rate

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.

Radioactive Concentration-Survey of Depth Distribution in Soil

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.

Radioactive Concentration-Seawater

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

Radioactive Concentration-Marine Soil

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

Radioactive Concentration-Deposition

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

Radioactive Concentration-Soil /  Environment Sample Analysis

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.

Radioactive Concentration-Atmosphere Dust (floating)

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

Radioactive Concentration-Atmosphere Dust (fallout)

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

Radioactive Concentration-River Water

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

Radioactive Concentration-River Soil

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

Radioactive Concentration-Drinking Water

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

Radioactive Concentration-Game Meat and Aquatic organism

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

Radioactive Concentration-towing monitoring

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

Radioactive Concentration-Food

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

Updates All Updates

2024.01.16

  The 2023 survey results have been added to the following survey results.
   ・Air Dose RateーVehicle-borne SurveyーVehicle-borne Survey Conducted by TEPCO
   ・Radioactive Concentration-Game Meat and Aquatic organismーAquatic organismーReadings of the Monitoring on Radioactivity Level in fish and shellfish by TEPCO
  The survey results up to September, 2023 have been added to the survey results below.
   ・Radioactive Concentration-SeawaterーSeawaterーReinforcement of marine environment monitoring related to the release of ALPS-treated water into the oceans
2023.12.12

  The following new contents have been released.
   ・Air Dose RateーWalk-borne SurveyーMeasurement results of specific reconstruction and revitalization base areas (Tomioka point bases)
2023.12.05

  The 2023 survey results have been added to the following survey results.
   ・Air Dose Rateー Survey Meter (ambient dose equivalent rate)ーLocality data
  The survey results up to October, 2023 have been added to the survey results below.
   ・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
  The survey results up to June, 2023 have been added to the survey results below.
   ・Radioactive Concentration-River WaterーRiver / Lake WaterーFukushima River Tritium

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