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

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

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