Radiological Monitoring and Consequences - 5 May 2011

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)

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Radiological Monitoring and Consequences - 5 May 2011

by International Atomic Energy Agency

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