Update IAEA Assessment Fukushima Nuclear Accident Radiological Monitoring and Consequences - 30 March 2011


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Update IAEA Assessment Fukushima Nuclear Accident Radiological Monitoring and Consequences - 30 March 2011

  1. 1. Fukushima Nuclear Accident<br />Radiological monitoring and consequences<br />30 March 2011<br />
  2. 2. Gamma Dose Rates in µSv/hour14-29 March<br />Natural Background: 0.1 µSv/hour<br />
  3. 3. Gamma dose rate / 21 March[Japan-MEXT measurement/IAEA intepretation]<br />Normal natural background of gamma dose-rate: 0.1µSv/h<br />Maximum levels @ <br />30 km zone : 90 µSv/h)<br />
  4. 4. I-131 and Cs-137 deposition to soil<br />Measurements done by Japan authorities<br />Soil sampling from March 18-26:<br />25-58 km from Fukushima NPP <br />depth: 5 cm<br />9 locations<br />Results:<br />High deposition and large variability<br />I-131: 0.2 to 25 MBq/m2<br />Cs-137: 0.02 to 3.7 MBq/m2<br />
  5. 5. I-131 and Cs-137 deposition to soil<br /><ul><li>Highest value in a relative small area N-West to Fukushima NPP
  6. 6. The first assessment indicates that one of the IAEA operational criteria for evacuation is exceeded in Iitate village</li></li></ul><li>Pu-238 and Pu-239/240 in soil(Japanese authorities)<br />Measured at Fukushima NPP: within the range of Japanese background<br />Seeking further information about origin<br />
  7. 7. Monitoring of drinking water<br />Most recent data are below the levels established by Japanese authorities <br />Recommendations for restrictions on drinking water being lifted in most locations. <br />As of 28 March, recommendations for restrictions based on I-131 concentration remain in place in 4 locations of Fukushima prefecture. <br />
  8. 8. Vegetables, fruits and milk24-29 March<br />98 food samples taken from 11 prefectures (Chiba, Fukushima, Gunma, Ibaraki, Kanagawa, Miyagi, Nagano, Niigata, Saitama, Tochigi and Yamagata)<br />I-131, Cs-134 and Cs-137: <br />Level not detected or below Japanese regulation values<br />
  9. 9. I-131 Test in children’s Thyroid 24-28 March <br />Japanese authorities<br />203 measurements <br />Kawamata and Iwaki <br />Quantitative detailed data not provided<br />“Did not reveal any levels of exposure that would be a health concern”<br />
  10. 10. IAEA Experts Dispatched to Japan<br />Radiation Monitoring Team<br />Team 1 (4) : 17 March-01 April, Tokyo<br />Team 2 (4) : 21 March -04 April, Fukushima<br />Team 3 (4) : 30 March – to replace Team 1<br />Food and Safety Team (3) : 25 March- 04 April<br />Food safety ( IAEA), Analytical approach and data analysis (IAEA) , food safety in emergency situation (FAO)<br />Marine Monitoring Assessment Observer: 02 April<br />
  11. 11. IAEA Radiation monitoring teams<br />March 29, 1st team <br />8 locations in Tokyo region <br />Gamma-dose rates: 0.02 to 0.19 µSv/h<br />Natural background: 0.1 µSv/h<br />March, 29, 2nd team <br />Radius of 32 to 62 km from the Fukushima NPP<br />Dose rates: 0.5 to 6.8 µSv/h<br />Beta-gamma contamination: 0.05 to 0.45 MBq/m2<br />
  12. 12. Joint FAO/IAEA Food Safety Assessment Team<br />Met with local government authorities in Fukushima, Ibaraki and Tochigi prefectures<br />Discussed various issues related to the contamination of food and the agricultural environment<br />Local government authorities briefed the team on:<br /><ul><li>Principal agricultural products affected
  13. 13. Main production areas and production methods (greenhouses, open-air)
  14. 14. Levels of contamination found (air, tap/ground water, vegetables)
  15. 15. Monitoring of soil contamination</li></ul>Focus of mission:<br />Remediation strategies and techniques related to plant and animal production, food traceability and water/soil characterization<br />
  16. 16. IAEA/Joint Radiation Emergency Management Plan<br />Regular activities via tele/videoconference<br />As of March 30: WHO liaison officer working at IEC<br />
  17. 17. Singapore Radiation Monitoring Information<br />Cabbages imported from Japan:<br />I-131: 936 Bq/Kg (C.A 100 Bq/Kg)<br />Up to 9 times the recommended values of the Codex Alimentarius.<br />