Source:
Japanese Broadcasting CorporationJapan's science ministry has detected extraordinarily high levels of radioactive cesium in seafloor samples collected off Miyagi and Ibaraki Prefectures.
Experts say monitoring should be stepped up over a larger area to determine how fish and shell fish are being affected.
The ministry collected samples from 12 locations along a 300-kilometer stretch off Fukushima prefecture's Pacific coast between May 9th and 14th. It hoped to get an idea about the spread of nuclear contamination caused by the accident at the Fukushima Daiichi nuclear power plant.
Radioactive substances were found in all locations, including those off Miyagi and Ibaraki Prefectures, which had not been previously investigated.
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http://www3.nhk.or.jp/daily/english/28_23.html
Whille of course we in the country of America suffer with ADD and have moved along to Palin's bus tour this is looking, from what I can make of it, much more serious than we are hearing about from the American press.
My interpretation is that several locations where these extremely high levels of radiation were found are 10 kilometers off the coast in a stretch 300 kilometers long. 10 kilometers is a huge distance off the coast to see these kinds of levels of radiation.