Maps

Spread of radioactive contamination in Japan (Italiano日本語)

Hayakawa's Map, December 9, 2011

The radioactive pollution caused by the Fukushima accident has spread patchy within a radius of about 250 km around the Fukuashima Daiichi nuclear power plant.

This page collects maps of radioactive contamination grouped in two paragraphs:

1. Grownd and aerial measuring results maps.
2. Radioactivity in the sea, rivers and lakes.

See also CTBTO, SPEEDI and Wiki maps.


  • Radiation dose distribution map

    Radiation dose distribution map of the Fukushima accident. Source: MEXT.

    Map of aerial surveys of the distribution of radiation doses published by the Ministry of Education, Science and Technology of Japan (MEXT). The values ​​are expressed in microSieverts per hour (μSv/h).
    To access the map you have to accept the conditions of use written in Japanese by clicking the left button at the bottom of the link.
    MEXT, 2012.

  • Radiation contour map of the Fukushima Daiichi accident – 5th Edition

    Radiation contour map of the Fukushima Daiichi accident. Yukio Hayakawa, Gumma University, Dec. 9, 2011

    This map is based on a series of data on intensity of radiation doses from different sources, updated to 28 November 2011. It was compiled by prof. Yukio Hayakawa and is considered the most comprehensive contour map of the radioactive contamination.
    The method adopted is the commonly procedure practiced by geologists for geological mapping, exploration of resources, and scientific research.
    The values ​​are expressed in microSieverts per hour (μSv/h).
    Yukio Hayakawa, Gumma University, December 9, 2011.

  • Real-time maps of the radioactivity in Fukushima Prefecture

    The number and the locations of radiation gauges in the district of Koriyama. Source: MEXT

    Dose levels of environmental radioactivity collected every 10 minutes between 50 cm and 1 meter above the ground by a network of dosimeters installed in Fukushima Prefecture.
    The values ​​are expressed in microSieverts per hour (μSv/h).
    The system has been running since February 21, 2012. Measurements are available in real time on the MEXT website.
    Radiomap, MEXT. Real time.

  • Naver Radiation – Maps & Info

    Map of the environmental radioactivity

    Level environmental radioactivity daily survey 1 meter above the ground with transportable monitoring post. Data collected by prefectures and published by MEXT.
    The values ​​are expressed in microSieverts per hour (μSv/h).
    Naver/MEXT. Daily updates (Japanese).

  • Cesium-137 deposition and contamination of Japanese soils

    Estimation of the concentration of cesium-137 in soil of Japan. GISS, October 2011. Source: PNAS

    The research group led by Teppei Yasunari, of the Goddard Earth Sciences Technology and Research Center (GESTAR), has used the system Flexpart to estimate the dynamics of Cesium-137 deposition and contamination of Japanese soils caused due to the Fukushima nuclear accident.
    Radioactivity levels are expressed in Becqerel per kilo (Bq/kg).
    The FLEXPART model is a Lagrangian Particle Dispersion Model developed at the Norwegian Institute for Air Research (NILU) in the Department of Atmospheric and Climate Research.
    GISS. PNAS, October 5, 2011.

  • Assessment of individual radionuclide distributions in central-east Japan
    This study was conducted by the research group led by Norikazu Kinoshita of the Tsukuba University. Between March and May 2011, scientists have collected and analyzed several samples of soil in the central-eastern Japan. The maps show the assessment of individual radionuclide distributions including cesium, iodine, tellurium and strontium from the Fukushima nuclear accident.
    The measures are expressed in thousands of Becqerel per cubic meter (kBq/m3).
    PNAS. September 29, 2011.

  • Map of the distribution of cesium 134 and 137 – september 2011 (MEXT).

    Deposition of Cesium, 250 km around Fukushima plant.
    September 14 and 18, 2011. Source: MEXT via Nikkei.

    The distribution of cesium-134 and 137 deposition (Bq/m²) measured from helicopter between Sept. 14 and 18, within 250 km around Fukushima Daiichi nuclear power plant. The map shows the level of contamination of the ten prefectures in the north-east of the island of Honshu, including Tokyo, Chiba and Kanagawa.
    The levels of contamination are given in Becquerel per square meter (Bq/m2).
    For comparison, after the Chernobyl accident, the areas with contamination exceeding 37,000 Bq/m2 were defined as contaminated area (see related article by Asahi Japan Watch).
    Japan Science Ministry (MEXT) via Nikkei (in Japanese). September 14 and 18, 2011.

  • Simulation of behavior in the atmosphere of the radioactive material released from Fukushima Daiichi NPP

    Simulation map of I-131 and Cs-137 spread from March 11 to 29, 2011. Source: Toshimasa Ohara, NIES

    Radioactive iodine and cesium from the Fukushima No. 1 nuclear power plant likely spread across a wide area encompassing Tohoku, Kanto and parts of Chubu, according to a simulation by the National Institute for Environmental Studies (NIES).

    In early May, the science ministry published the results of the System for Prediction of Environmental Emergency Dose Information (SPEEDI).

    Many of SPEEDI’s radiation monitoring locations recorded values close to the ones estimated by NIES’ simulation project. But the SPEEDI measurements were largely limited to an area close to the plant.
    Toshimasa Ohara, NIES, August 25, 2011.


  • 福島第一原子力発電所から放出された放射性物質の大気輸送沈着シミュレーション

    セシウム137地上近くの大気濃度、2011年3月12日~3月23日
    国立環境研究所の研究グループは。

    東京電力福島第一原子力発電所から放出された放射性物質の大気中の挙動を明らかにするために、日本中央域を対象とした大気輸送沈着シミュレーションを実施しました。ヨウ素131とセシウム137の大気濃度、沈着量、沈着積算量の空間分布(2011年3月12日~3月23日)。
    国立環境研究所の研究グループは、2011年8月11日。

  • Map of the distribution of cesium 134 and 137 – May 2011 (MEXT-DOE)

    Deposition of Cesium, 100 km around Fukushima plant.
    May 26, 2011. Source MEXT-DOE

    The distribution of cesium-134 and 137 deposition (Bq/m²) measured from helicopter on May 26, within 100 km around Fukushima Daiichi nuclear power plant.
    Japan Science Ministry (MEXT), US Department of Energy (DOE). May 26, 2011.

  • 20110312福島第一原子炉から放出された放射能雲大気中拡散
    IRSN(フランス放射線防護原子力安全研究所が、発表した「2011年3月12日より福島第一原子炉から放出された放射能雲大気中拡散シミュレーション」3本をRIP。
    最初:–大気中に放出された放射性物質の拡散シミュレーション
    真ん中: 放射性物質放出期間中、無防備状態(屋外)において 1 歳児が受け得る対全身放 射線量
    最後: 放射性物質放出期間中、無防備状態(屋外)において 1 歳児の甲状腺が受け得る放 射線量
    フランス放­射線防護原子力安全研究所、YouTube、2011年3月29日。

  • 2. Radioactivity in the sea, rivers and lakes

  • Diffusion of cesium in the backdrops (sea, rivers and lakes)

    Radioactive deposition surveys in the backdrops (sea, rivers, lakes) of Japan. Source: NHK, Jan. 2012

    Screen shot of a map from the Unknown News on the Radioactive Contamination of the Sea, a documentary by Japanese public broadcaster NHK.
    The measures are expressed in Becqerel per kilo (Bq/kg).
    NHK, January 15, 2012.

  • Sea Water Impact
    Dispersal model into the Pacific Ocean from 18 March to 11 November 2011. This is not a representation of the radiactive plume concentration.
    ASR, November 11, 2011.

  • Model of spread of the Cesium-137 in the Pacific Ocean (Japanese pdf).

    Spread of Cesium-137 in the Pacific Ocean between July 2011 and April 2018. JAEA

    Forecast for the spread of Cesium-137 in the Pacific Ocean between July 2011 and April 2018. Prevision model by the Japan Atomic Energy Agency (JAEA).
    The values ​​are expressed in Becquerel per liter (Bq/l)
    JAEA, August 2011.

  • Radioactivity level in marine fish
    Map of monitoring radioactivity in marine fish.
    Google Docs, map updated the April 18, 2011.

  • Simulations of the dispersion in seawater
    Simulations using the 3D SIROCCO ocean circulation model to investigate the dispersion in seawater of radionuclides emitted by the Fukushima nuclear plant.
    Toulouse University, CNRS, March 2011.

  • Related pages



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    2 Responses to Maps

    1. Backyard World says:

      AJW: Simulation shows radiation may have reached 15 prefectures (August 29, 2011)
      http://ajw.asahi.com/article/0311disaster/fukushima/AJ201108298154

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