Radiological Monitoring and Consequences

Fukushima Nuclear Accident
Radiological Monitoring
and Consequences
7 April 2011

Gamma Dose Rates ( microSievert /hour) 14 March – 6 April
Natural Background: 0.1 microSv/hour

Gamma Dose Rate in 47 Prefectures - 6 April
Natural background: 0.1µSv/h
Fukushima prefecture: 2.4 µSv/h

Daily deposition of iodine-131 (Becquerel /m2)25 March to 5 April

Daily deposition of cesium-137 (Becquerel /m2)25 March to 5 April

Monitoring of drinking water7 April
Iodine-131 and cesium-137 well below restriction levels in all prefectures
Recommendations for restrictions based on iodine-131 remains in place in 1 village of Fukushima prefecture as precautionary measure

IAEA measurements - Route DDose rate (µSv/h)

Food Restrictions
As of 4 April, food restrictions (distribution and/or consumption) were in place
Fukushima : leafy and flower-headed brassicas
(broccoli, cauliflower)
Ibaraki : unprocessed raw milk, parsley, spinach and kakina
Tochigi and Gunma: spinach and kakina
Chiba : spinach (KatoriCity and TakoTown)
spinach and parsley (Asahi City)

Radiation Monitoring in FoodstuffsReported 6 April by JAPAN (MHLW)
(Fukushima prefecture) From26 of 41 samples for various vegetables, spinach and other leafy vegetables
- I-131, Cs-134, Cs-137 exceeded the regulation
values set by the Japanese authorities.
(8 prefectures) From 52 of 78 samples for various vegetables, fruit (strawberry) and unprocessed raw
milk
- I-131, Cs-134, Cs-137 were either not detected
or well below the regulation values set by the
Japanese authorities

Collaboration between IAEA and CTBTO
CTBTO provided to IAEA access to the data of its monitoring stations world-wide
WMO provided to IAEA a forecast of the movement of air masses in regional and global scale
IAEA, in collaboration with CTBTO and WMO estimated global distribution of radioactivity released

International Monitoring Data submitted to IAEA
The following countries have submitted data on radioactivity in air:
Austria, Belgium, Bulgaria, Canada, China, Finland, France, Greece, Iran, Ireland, Italy, Malaysia, Poland, Romania, Russian Federation, Spain, Sweden, Switzerland, and Ukraine
All levels are very low

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Radiological Monitoring and Consequences

by International Atomic Energy Agency on Apr 07, 2011

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