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The study was conducted by Woods Hole Oceanographic Institution chemist Ken Buesseler and two colleagues based in Japan, Michio Aoyama of the Meteorological Research Institute and Masao Fukasawa of the Japan Agency for Marine-Earth Science and Technology.
Their study finds that the levels of radioactivity, while high, are not a direct threat to humans or marine life, but cautions that the effect of accumulated radionuclides in marine sediments is poorly known.
The scientists also found that the releases decreased in May by a factor of 1,000, "a consequence of ocean mixing and a primary radionuclide source that had dramatically abated," they report.
While concentrations of some radionuclides continued to decrease, by July they were still 10,000 times higher than levels measured in 2010 off the coast of Japan.
This indicates that the plants "remain a significant source of contamination to the coastal waters off Japan," the researchers report.
"There is currently no data that allow us to distinguish between several possible sources of continued releases," says Buesseler.
The study used data on the concentrations of cesium-137, cesium-134 and iodine-131 as a basis to compare the levels of radionuclides released into the ocean with known levels in the sea surrounding Japan prior to the accident.
CNA today announced the hiring of Christopher J. Winslow to serve as the not-for-profit research and analysis organization's Chief Financial Officer, senior vice president and Treasurer. Reporting to Robert Murray, CNA President and CEO, Winslow will assume his duties at CNA on January 1, 2012.
I recommend Arnie Gundersen of Fairewinds Associates for actual data on the disasterous event.
The resulting paper, Impacts of the Fukushima Nuclear Power Plants on Marine Radioactivity, is published in the current issue of the journal Environmental Science & Technology.
A new study has found that discharges from the defunct Fukushima Dai-Ichi nuclear power plants peaked one month after a March 11 earthquake and tsunami brought on the nuclear accident, and continued through at least July.
The study was conducted by Woods Hole Oceanographic Institution chemist Ken Buesseler and two colleagues based in Japan - Michio Aoyama of the Meteorological Research Institute and Masao Fukasawa of the Japan Agency for Marine-Earth Science and Technology.