The Distribution Map of Radiation Dose, etc., has been created on the basis of the results of a variety of monitoring activities conducted by the MEXT to give public access to the details of the influence of radioactive substances discharged from TEPCO Fukushima Daiichi Nuclear Power Plant.

MEXT Extension Site of Distribution Map of Radiation Dose, etc.
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This Extension Site of the Distribution Map for Radiation Dose (hereafter “this site”) was prepared in the course of the 2011 Strategic Funds for the Promotion of Science and Technology and entitled “Establishment of the Base for Taking Measures for Environmental Impact of Radioactive Substances—Study of the Distribution of Radioactive Substances”; the 2011 Radioactivity Measurement and Investigation Project commissioned by MEXT entitled “Investigation and Study of the Secondary Distribution of Radioactive Substances due to the Accident at the Fukushima Daiichi Nuclear Power Plant”; and the 2011 Radioactivity Measurement and Investigation Project entitled “Establishment of Technique for Identifying Long-term Impact of Radioactive Substances due to the Accident at the Fukushima Daiichi Nuclear Power Plant based on the Distribution Map of Radiation Dose, etc., the Vehicle-Borne Survey Map, and the results of airborne monitoring projects under the MEXT in order to observe in detail the impacts of radioactive substances discharged from the TEPCO Fukushima Daiichi Nuclear Power Plant.

The Distribution Map of Radiation Dose, etc., is available in either the "Digital Japan Edition" , "PDF Edition" , or "Smartphone Edition." Click the image you want to view in full size.

Read the User Agreement and associated documents prior to use.

Update Information

March 10, 2016
The results of the distribution map of radiation doses (eleventh vehicle-borne survey) were released in the Digital Japan Edition and the PDF Edition.
February 2, 2016
The results of the airborne monitoring (with dose rate of Nov. 4, 2014) were released in the Digital Japan Edition and the PDF Edition.
November 20, 2015
The results of the distribution map of radiation doses (tenth vehicle-borne survey) were released in the Digital Japan Edition and the PDF Edition.
July 10, 2015
The results of the distribution map of radiation doses (2014 soil investigation) were released in the Digital Japan Edition and the PDF Edition.
March 16, 2015
The results of the distribution map of radiation doses (ninth vehicle-borne survey) were released in the Digital Japan Edition and the PDF Edition.
February 13, 2015
The results of the airborne monitoring (with dose rate of Nov. 7, 2014) were released in the Digital Japan Edition and the PDF Edition.
October 23, 2014
The results of the distribution map of radiation doses (eighth vehicle-borne survey) were released in the Digital Japan Edition and the PDF Edition.
May 19, 2014
The results of the distribution map of radiation doses (seventh vehicle-borne survey) were released in the Digital Japan Edition and the PDF Edition.
March 7, 2014
The results of the airborne monitoring (with dose rate of Nov. 19, 2013) were released in the Digital Japan Edition and the PDF Edition.
December 25, 2013
The results of the airborne monitoring (seventh dose rate) were released in the Digital Japan Edition and the PDF Edition.
December 9, 2013
The results of the distribution map of radiation doses (sixth vehicle-borne survey) were released in the Digital Japan Edition and the PDF Edition.
November 27, 2013
The results of the distribution map of radiation doses (fifth vehicle-borne survey) were released in the Digital Japan Edition and the PDF Edition.
May 13, 2013
The results of the airborne monitoring (with values converted to radiation levels as of Mar. 11, 2013) were released in the Digital Japan Edition and the PDF Edition. The measured value on the airborne monitoring results in the Digital Japan Edition can be viewed from now.
March 12, 2013
Airborne monitoring results in the Digital Japan Edition and the PDF Edition included the data of the 6th and the data outside the 80 km radius area.
February 19, 2013
The results of the airborne monitoring (unmanned helicopter), the distribution map of radiation doses (third soil investigation), and the vehicle-borne survey (fourth) were released in the Digital Japan Edition and the PDF Edition.
December 20, 2012
The measured value of the measurement point on the Distribution Map of Radiation Dose (Vehicle-borne survey) in the Digital Japan Edition can be viewed from now.
November 30, 2012
Airborne monitoring results in the Digital Japan Edition and PDF Edition were added to the Nationwide Edition and the fifth + outside the 80 km radius area, the vehicle-borne survey results were added to the second + third vehicle-borne survey results, and, in addition, the distribution map of radiation dose was added to the second investigation results. The distribution map of radiation dose for the Digital Japan Edition displays the measured values at the measurement points.
October 15, 2012
Distribution Map of Radiation Dose, Digital Japan Edition (Vehicle-borne survey map) was added with the results of the second + the third vehicle-borne surveys (the results of measurement carried out on December 5–28, 2011 and March 13–30, 2012).
September 28, 2012
The PDF Edition was updated. (The past data such as those obtained from airborne monitoring can be also viewed.)
July 11, 2012
The measurement results of the Kinki and Chugoku Regions were published and included in the airborne monitoring results of the Digital Japan Edition.
The locations of primary and junior high schools across the country were included in the Digital Japan Edition.
June 6, 2012
The measurement results of the Shikoku and Kyushu Regions and Okinawa Prefecture were published and included in the airborne monitoring results of the Digital Japan Edition.
April 23, 2012
Snow cover data were included in the airborne monitoring results of the Digital Japan Edition.
March 21, 2012
The measurement results from Dec. 5 to 28 were overlaid on the Distribution Map of Radiation Dose, etc., (Vehicle-Borne Survey Map) of the Digital Japan Edition.
An updated was made to the vehicle-borne survey data of the PDF Edition (survey conducted from Dec. 5 to 28, 2011).
March 12, 2012
The airborne monitoring data from the no-entry zones and planned evacuation zones were published and included in the airborne monitoring results of the Digital Japan Edition.
February 17, 2012
An updated was made to the PDF Edition (with values converted to radiation levels as of Nov. 5, 2011).
February 13, 2012
An updated was made to the Distribution Map of Radiation Dose, etc., of the Smartphone Edition.
January 23, 2012
The results of the 4th MEXT airborne monitoring were published and included in the airborne monitoring results of the Digital Japan Edition.
The Distribution Map of Radiation Dose, etc., covering the entire East Japan was published and included in the PDF Edition.
December 22, 2011
The Distribution Map of Radiation Dose, etc., of the Smartphone Edition was published.
December 21, 2011
The measurement results for Aichi, Aomori, Ishikawa, and Fukui Prefectures were published and included in the airborne monitoring results of the Digital Japan Edition.
The measurement results for Iwate, Shizuoka, Nagano, Yamanashi, Gifu, and Toyama Prefectures were published and included in the airborne monitoring results of the PDF Edition.
The soil concentration maps for tellurium-129 m, silver-110 m, iodine-131, plutonium-238, 239, and 240, and strontium-89 and 90 were overlaid on the Distribution Map of Radiation Dose, etc., of the PDF Edition.
December 1, 2011
The measurement results for Iwate, Shizuoka, Nagano, Yamanashi, Gifu, and Toyama Prefectures were published and included in the airborne monitoring results of the Digital Japan Edition.
The soil concentration maps for tellurium-129 m, silver-110 m, iodine-131, plutonium-238, 239, and 240, and strontium-89 and 90 were added to the Distribution Map of Radiation Dose, etc., of the Digital Japan Edition.
November 8, 2011
The official edition of monitoring results for Tokyo and Kanagawa Prefecture was published and included in the airborne monitoring results.
October 18, 2011
The MEXT Extension Site of the Distribution Map of Radiation Dose, etc., was opened for public access.

The interactive map provides detailed views of areas of interest.

Digital Japan Edition
This is a map generated using the Digital Japan Web System available on the Digital Japan Portal Web Site. Interactive display operations enable zooming in to and out from locations of interest on the map and overlaying different types of monitoring data on it.
PDF Edition
Get Adobe ReaderClick the image to download and view the PDF-format map.


Smartphone Edition
This map optimized the layout to smart phones. Interactive display operations enable zooming in to and out from locations of interest on the map and overlaying different types of monitoring data on it.
The maps used in this site are copied from the Digital Japan Basic Map (Cartographic Information) published by the GSI, with permission of the GSI Director-General (Approval No.: 2011 Data Copy No. 597).