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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

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

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