Radiological Monitoring and Consequences
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Radiological Monitoring and Consequences



Fukushima Nuclear Accident

Fukushima Nuclear Accident

7 April 2011



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Radiological Monitoring and Consequences Radiological Monitoring and Consequences Presentation Transcript

  • Fukushima Nuclear Accident
    Radiological Monitoring
    and Consequences
    7 April 2011
  • Gamma Dose Rates ( microSievert /hour) 14 March – 6 April
    Natural Background: 0.1 microSv/hour
  • Gamma Dose Rate in 47 Prefectures - 6 April
    Natural background: 0.1µSv/h
    Fukushima prefecture: 2.4 µSv/h
  • Daily deposition of iodine-131 (Becquerel /m2)25 March to 5 April
  • Daily deposition of cesium-137 (Becquerel /m2)25 March to 5 April
  • Monitoring of drinking water7 April
    Iodine-131 and cesium-137 well below restriction levels in all prefectures
    Recommendations for restrictions based on iodine-131 remains in place in 1 village of Fukushima prefecture as precautionary measure
  • IAEA measurements - Route DDose rate (µSv/h)
  • Food Restrictions
    As of 4 April, food restrictions (distribution and/or consumption) were in place
     Fukushima : leafy and flower-headed brassicas
    (broccoli, cauliflower)
     Ibaraki : unprocessed raw milk, parsley, spinach and kakina
     Tochigi and Gunma: spinach and kakina
    Chiba : spinach (KatoriCity and TakoTown)
    spinach and parsley (Asahi City)
  • Radiation Monitoring in FoodstuffsReported 6 April by JAPAN (MHLW)
    • (Fukushima prefecture) From26 of 41 samples for various vegetables, spinach and other leafy vegetables
    - I-131, Cs-134, Cs-137 exceeded the regulation
    values set by the Japanese authorities.
    • (8 prefectures) From 52 of 78 samples for various vegetables, fruit (strawberry) and unprocessed raw
    - I-131, Cs-134, Cs-137 were either not detected
    or well below the regulation values set by the
    Japanese authorities
  • Collaboration between IAEA and CTBTO
    CTBTO provided to IAEA access to the data of its monitoring stations world-wide
    WMO provided to IAEA a forecast of the movement of air masses in regional and global scale
    IAEA, in collaboration with CTBTO and WMO estimated global distribution of radioactivity released
  • International Monitoring Data submitted to IAEA
    The following countries have submitted data on radioactivity in air:
    Austria, Belgium, Bulgaria, Canada, China, Finland, France, Greece, Iran, Ireland, Italy, Malaysia, Poland, Romania, Russian Federation, Spain, Sweden, Switzerland, and Ukraine
    All levels are very low