Radiological Monitoring and Consequences - 5 May 2011
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Radiological Monitoring and Consequences - 5 May 2011

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Radiological Monitoring and Consequences - 5 May 2011 Radiological Monitoring and Consequences - 5 May 2011 Presentation Transcript

  • Fukushima Nuclear Accident
    Radiological Monitoring
    and Consequences
    5 May 2011
  • Gamma Dose Rates in 7 Prefectures24 March – 4 May
    Natural Background: 0.1 µSv/h
  • Gamma Dose Rate in47 Prefectures- 4 May
    Fukushima prefecture: 1.7 µSv/h
  • Cs-137daily deposition (Bq /m2)15 April-2 May
  • I-131daily deposition (Bq /m2)15 April-2 May
  • I-131 and Cs-137 Concentration in airat Fukushima Daiichi West Gate (1 Km from NPP)
  • Monitoring of drinking water2 May
    I-131 and Cs-137 detected in 2-6 prefectures respectively and remain far below restriction levels in all 47 prefectures.
    Recommendations for restrictions for infants based on I-131: Still in place in 1 village of Fukushima prefecture as precautionary measure.
  • Monitoring of public and workers
    As of April 27: 175045 people had been screened (NISA)
    Internal+ External doses received by emergency workers until the end of March 2011 (TEPCO):
    2 workers: 200-250 mSv.
    8 workers: 150-200 mSv
    11 workers: 100-150 mSv.
    Other workers: below 100 mSv.
    • 2461 samples from 18 prefectures
    • 2239 samples (91%): below the regulation values
    • 222 samples (9 %): above the regulation values – mainly vegetables: From 6 prefectures (Chiba, Fukushima, Gunma, Ibaraki, Tochigi, Tokyo)