Radiological Monitoring and Consequences
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Fukushima Nuclear Accident
Radiological Monitoring and Consequences
7 April 2011
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Gamma Dose Rates ( microSievert /hour) 14 March – 6 April
Natural Background: 0.1 microSv/hour
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Ibaraki(Mito)
Saitama(Saitama)
Tokyo(Shinjyuku)
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Gamma Dose Rate in 47 Prefectures - 6 April
Natural background: 0.1µSv/h
Fukushima prefecture: 2.4 µSv/h
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Daily deposition of iodine-131 (Becquerel /m2)25 March to 5 April
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Daily deposition of cesium-137 (Becquerel /m2)25 March to 5 April
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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
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IAEA measurements - Route DDose rate (µSv/h)
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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 (Katori City and Tako Town) spinach and parsley (Asahi City)
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Radiation Monitoring in FoodstuffsReported 6 April by JAPAN (MHLW)
• (Fukushima prefecture) From 26 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
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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
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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