Radionuclide station RN20 in Beijing. CTBTO, 2009

This page collects some maps of the spread of radioactivity based on data by the international organization CTBTO.

The Comprehensive Nuclear-Test-Ban Treaty Organization is an international organization to control nuclear proliferation.
Its seat will be Vienna and depends on the UN.

The organization has a network of 61 radionuclide stations in the world, using air samplers to detect radioactive particles.

Until 2011, the CTBTO statute does not require the publication of the data collected, but they are available to 1200 institutions and to the governments of 120 states which adhere to the Comprehensive Nuclear-Test-Ban Treaty. Among these there is also Japan, where is located the radionuclide station RN 38 Takasaki.

  • Fukushima related measurements

    The radioactivity of Fukushima Daiichi detected by radionuclide stations from March 12 to April 9, 2011

    More than 35 stations of the CTBTO system in the northern hemisphere has detected in the atmosphere the traces of the Fukushima accident, also measured in the southern hemisphere.
    CTBTO, April 13, 2011.

  • Maps based on data from the CTBTO monitoring stations measurements

  • Dispersion of the radioactive cloud over The Northern Hemisphere

    Dispersion of the Cesium 137 over The Northern Hemisphere from March 15 to May 1, 2011. RIU

    Maps of the Rhenish Institute for Environmental Research based on CTBTO data.
    Rheinisches Institut für Umweltforschung (RIU), May 15, 2011.

  • Atmospheric dispersion of radionuclides from Fukushima Daiichi

    Mappa della deposizione al suolo del cesio-137 in Asia e in Nord America. 6 aprile 2011 (fonte: CEREA)

    Map of ground deposition of caesium-137 for the Fukushima-Daichii accident, with a movie of the activity in the air (caesium-137, ground level).
    CEREA, joint laboratory École des Ponts ParisTech and EdF R&D, April, 2011.

  • Fukushima Daiichi dispersion of radioactivity from 12 to 18 March 2011

    Fukushima plume. Potential spread of the Iodine-131, 12 to 18 March 2011.
    The plume is in a 5 colors scale. The purple color (Area A) defines a region with a maximum load of 0.3 microSievert per hour (μSv/h). This value corresponds to the dose average of global background exposure. The blue marks until at 3 μSv/h. With orange are identified areas with the dose of about 3 milliSievert per hour (mSv/h). (Source & credit ZAMG)

    Two animated maps in local scale (Japan, Pacific) and global, with German article.
    Institute for Meteorology of Austria (ZAMG), March 15, 2011.

  • Related pages

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