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Radiological Monitoring and Consequences

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