Researchers Find Radiation Hot Spots Off Coast Near Fukushima

Japan’s nuclear regulator and a team of researchers completed a set of sea floor monitoring earlier this summer. They found that areas of the sea floor where there is more muddy soil in low spots tended to concentrate cesium 137. The cesium is assumed to have bonded to the mud particles.

The research corridor was roughly up to 25km out to sea.

Average cesium 137 concentrations in the sea floor were 90 bq/kg
Areas 4 km out to sea, 20 locations had concentrations of 1000 bq/kg
Areas 6 km out to sea had levels of 2000 bq/kg in some locations

This information was originally published in July 2014. While TEPCO has been publishing readings of cesium in the water near the plant that seem unusually low, the sea bed is another story. Long lived radioactivity doesn’t just go away, it moves somewhere else.

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