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

14-M

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15-M

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16-M

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17-M

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18-M

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19-M

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20-M

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21-M

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22-M

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23-M

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25-M

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26-M

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27-M

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28-M

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30-M

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31-M

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01-A

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02-A

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03-A

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04-A

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05-A

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06-A

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0.200

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0.600

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1.000

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1.600

Ibaraki(Mito)

Saitama(Saitama)

Tokyo(Shinjyuku)

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 (Katori City and Tako Town) spinach and parsley (Asahi City)

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

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