Radiological Consequences of the Fukushima Nuclear Accident - 28 March 2011
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Radiological Consequences of the Fukushima Nuclear Accident - 28 March 2011

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Radiological Consequences of the Fukushima Nuclear Accident - 28 March 2011 Radiological Consequences of the Fukushima Nuclear Accident - 28 March 2011 Presentation Transcript

  • Fukushima Nuclear Accident
    Radiological consequences
    28 March 2011
  • Gamma Dose Rates in µSv/hour15-27 March
    Natural Background: 0.1 µSv/hour
  • Daily deposition: I-131/ Cs-137Bq/m2
  • Permissible limit-Japan:
    Adult: 300 Bq/l; Children/100 Bq/l
  • Permissible limit-Japan: 200 Bq/l
  • On-Site 3 exposed workers medical status
    March 24
    3 workers exposed to radiation (2 with feet/legs contamination)
    NIRS Hospital
    Radiation monitoring:
    Body dosimeter: 173, 179, 180 mSv
    (Dose limit for emergency workers in life saving operation: 250 mSv)
    Medical condition
    Transient redness (suggested a dose between 2000-3000 mSv locally)
    Under medical observation for 4 days.
    Latest news:
    All 3 patients were discharged (March 28 at 12:00 Tokyo time)
    2 patients with local legs problems: Regular medical follow-up
  • Point 4 (44km)
    Point 5 (55km)
    A
    Point 3 (41km)
    Point 6 (58km)
    Point 2 ( 32km)
    Point 7 (56km)
    Point 1 (32km)
    Point 8 (46 km)
    Point 12 (32km)
    B
    Point 11 (31km)
    Point 13 (43km)
    C
    Point 10 (30km)
    Point 9(29km)
    Point 19 (30km)
    Point 14 (42km)
    Point 21 (24km)
    Point 18 (34km)
    Point 22 (23km)
    Point 20 (25km)
    Point 15 (40km)
    Point 26 (30km)
    Fukushima Daiichi NPP
    Point 24 (19km)
    Point 23 (16km)
    Point 17 (36km)
    Point 30 (41km)
    D
    Point 25 (24km)
    Point 27(33km)
    Point 28 (36km)
    Point 29 (38km)
    Measurement locations at Fukushima region
  • Radiation Measurements
    Measurements at 35 locations in Fukushima and 20 in Tokyo and surrounding areas(dose rate & contamination)
    Collected sample swipes, air sampling from around most of the locations (same places, and more — for corroboration)
    Samples will provide more qualitative data and will be disseminated after analysis at Seibersdorf
  • Radiation Measurements (Cont’d).
    Beta-gamma contamination measurements ranged from 0.02 to 4.9 Megabecquerel per square meter
    Dose rate between 0.05 and 59 microsieverts per hour
    Distance between 16 to 70 kilometers
    2011/3/28
    10
  • IAEA Radiation monitoring team
    March 28, 1st team
    8 locations in Tokyo region
    Gamma-dose rates: 0.08 to 0.13 µSv/hour
    Natural background: 0.1 microsivert per hour
    March, 28, 2nd team
    Radius of 30 to 46 km from the Fukushima NPP
    Dose rates from 0.5 to 3 µSv/hour
    Beta-gamma contamination: from 0.02 to 0.33 MBq/m2
  • Monitoring of I-131 and Cs-137 in soilFukushima Prefecture
    Initial measurements: Spatial variability of deposition
    High depositions in some areas
    Further measurements and study are in progress