Radiological Consequences of the Fukushima Nuclear Accident - 28 March 2011

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

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Radiological Consequences of the Fukushima Nuclear Accident - 28 March 2011

by International Atomic Energy Agency

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