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Radiological Monitoring and Consequences - 5 May 2011

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International Atomic Energy Agency
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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.
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Radiological Monitoring and Consequences - 5 May 2011

  • 1. Fukushima Nuclear Accident Radiological Monitoring and Consequences 5 May 2011
  • 2. Gamma Dose Rates in 7 Prefectures24 March – 4 May Natural Background: 0.1 µSv/h
  • 3. Gamma Dose Rate in47 Prefectures- 4 May Fukushima prefecture: 1.7 µSv/h
  • 4. Cs-137daily deposition (Bq /m2)15 April-2 May
  • 5. I-131daily deposition (Bq /m2)15 April-2 May
  • 6. I-131 and Cs-137 Concentration in airat Fukushima Daiichi West Gate (1 Km from NPP)
  • 7. 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.
  • 8. 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.
  • 9.
  • 10. 2239 samples (91%): below the regulation values
  • 11. 222 samples (9 %): above the regulation values – mainly vegetables: From 6 prefectures (Chiba, Fukushima, Gunma, Ibaraki, Tochigi, Tokyo)