SPEEDI Maps

Akira Tsubosaka, senior official of the SPEEDI
Koji Sasahara, AP. July 19, 2011

This page collects some maps of environmental radioactivity based on the data of the System for Prediction of Environment Emergency Dose Information (SPEEDI).

SPEEDI is a streams information from a national network of detectors of the Nuclear Safety Division of the Ministry of Education, Culture, Sports, Science and Technology (MEXT). The network was built in 1986 at a cost of $140 million (11 billion yen).
In case of a radiological emergency, the system provides real-time forecasts by analyzing the data produced by a network of detectors scattered all over Japan. The Japanese government has published the SPEEDI data only on March 23, 2011.


Maps of environmental radioactivity based on SPEEDI

  • Environmental radioactivity and radiation information

    Mappa SPEEDI

    Map of the levels of radioactivity near nuclear power plants in Japan.
    Realtime radiation data collected by the MEXT via the SPEEDI.

    The map does not provide the data collected for Miyagi (Jan. 2012) and up to June 2011 did not provide the data for Fukushima.

    The values ​​are expressed in nanoGray per hour (nGy/h).

    Ministry of Education, Culture, Sports, Science and Technology (MEXT). Real-time updates.


  • Japan Radiation Maximum by Prefecture

    Japan Radiation Maximum by Prefecture. Target Map, April 1, 2011

    Interactive map of the maximum levels of radioactivity in the Prefectures of Japan based on data generated by SPEEDI, provided by MEXT and updated for April 1, 2011.
    The values ​​are expressed in nanoGray per hour (nGy/h). The map also shown numbers of the population by prefecture.
    Target Map, April 1, 2011.

  • Related pages



    This material is Open Content

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    One Response to SPEEDI Maps

    1. Pingback: SPEEDI « Fukushima Life

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