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» NRA disclosed the result of study ono seabed radioactivity

The Nuclear Regulation Authority has disclosed the results of its fiscal 2013 research into seabed radioactivity off the leaking, heavily damaged Fukushima No. 1 power station.

Ocean soil collected about 6 km away from Fukushima No. 1 plant contains as much 2,000 becquerels of cesium-137 per kilogram. The half-life of cesium is about 30 years.

NRA said that it is difficult to assess the figure because there is no standard to compare it with. The NRA said it will continue its research.

About 4 km off the facility, soil with 1,000 becquerels of cesium-137 was collected from about 20 locations, the NRA said, noting that soil tainted with cesium tends to accumulate in depressed places.

Cesium-137 was particularly high near the mouth of the Abukuma River, which flows through Fukushima and Miyagi prefectures. The highest reading found was 2,700 becquerels in soil 2.5 km east and 2.3 km south of the river’s mouth in Sendai Bay. But cesium concentrations in the areas did not fluctuate much during the year, the NRA said.
<Media Report>
NRA reveals cesium readings for seabed off Fukushima No. 1 (Japan Times)


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