City of Sapporo > Results of the Measurements for Radioactive Levels in Seawater in the Hokkaido Area (Department of Fisheries and Forestry of the Hokkaido Government）
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Update:May 11, 2011
Results of the Measurements for Radioactive Levels in Seawater in the Hokkaido Area (Department of Fisheries and Forestry of the Hokkaido Government）
For safety measures, the Hokkaido Government is monitoring the radioactive levels in seawater surrounding Hokkaido (off the Muroran, Erimo and Kushiro coast).
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(Bq/L) |
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Sampled dates |
Sampled locations |
Measurement results |
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Ocean area |
Sampled seawater layers |
Radioactive Iodine |
Radiocesium |
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April 12 |
Muroran coast |
Surface |
Not detected |
Not detected |
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Bottom |
Not detected |
Not detected |
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April 11 |
Erimo coast |
Surface |
Not detected |
Not detected |
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Bottom |
Not detected |
Not detected |
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April 11 |
Kushiro coast |
Surface |
Not detected |
Not detected |
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Bottom |
Not detected |
Not detected |
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Results from Past Measurements of Radioactivity in Seawater
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(Bq/L) |
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Sampled locations |
Monitoring period |
Radioactive Iodine |
Radiocesium |
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Results of the environmental radioactivity level survey (Ministry of Education, Culture, Sports, Science and Technology-Japan) |
National survey |
2007-2009 |
Not detected |
Not detected - 0.0028 |
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Hokkaido (Yoichi coast) |
2007-2009 |
Not detected |
0.0019 - 0.0022 |
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Results of measurements around the Tomari Nuclear Power Plant |
Area around the nuclear energy plants |
2007-2009 |
Not detected |
Not detected - 0.0029 |
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Aug-Sep. 2010 |
Not detected |
Not detected - 0.0018 |
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*1 Bq = measurement of the amount of radioactivity exerted
*2 By law, the maximum concentration of radiation accepted to be safe is 40 Bq/L and 90 Bq/L for I-131 and Cs-137 respectively.
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