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

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

    • Fukushima Nuclear Accident
      Radiological monitoring and consequences
      30 March 2011
    • Gamma Dose Rates in µSv/hour14-29 March
      Natural Background: 0.1 µSv/hour
    • 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)
    • 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
      High deposition and large variability
      I-131: 0.2 to 25 MBq/m2
      Cs-137: 0.02 to 3.7 MBq/m2
    • I-131 and Cs-137 deposition to soil
      • Highest value in a relative small area N-West to Fukushima NPP
      • 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
    • 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.
    • 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
    • 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”
    • 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
    • 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
    • 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
      • Main production areas and production methods (greenhouses, open-air)
      • Levels of contamination found (air, tap/ground water, vegetables)
      • Monitoring of soil contamination
      Focus of mission:
      Remediation strategies and techniques related to plant and animal production, food traceability and water/soil characterization
    • IAEA/Joint Radiation Emergency Management Plan
      Regular activities via tele/videoconference
      As of March 30: WHO liaison officer working at IEC
    • 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.