The document summarizes radiological monitoring and consequences from the Fukushima Nuclear Accident. Gamma dose rates were measured in 47 prefectures from March 24th to May 4th, with Fukushima prefecture recording a rate of 1.7 μSv/h. I-131 and Cs-137 were detected in drinking water samples from 2-6 prefectures respectively at levels below restriction levels. Internal and external radiation doses received by emergency workers through the end of March 2011 included 2 workers receiving 200-250 mSv and 8 receiving 150-200 mSv.

1. Fukushima Nuclear AccidentRadiological Monitoring and Consequences5 May 2011

2. Gamma Dose Rates in 7 Prefectures24 March – 4 MayNatural Background: 0.1 µSv/h

3. Gamma Dose Rate in47 Prefectures- 4 MayFukushima 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 MayI-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 workersAs 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 mSv11 workers: 100-150 mSv. Other workers: below 100 mSv.

9. 2461 samples from 18 prefectures

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)