福岛核事故救灾英雄盖棺无定论 - BBC中文网 - 国际. 美國研究：福島黑鮪魚輻射低. Bluefin tuna record Fukushima radioactivity. 28 May 2012Last updated at 22:45 ET By Jonathan Amos Science correspondent, BBC News Pacific Bluefin tuna are among the great marine travellers.
Radiation levels higher but safe off Fukushima Daiichi, scientists say. The findings are among those presented at an ocean science conferenceRadiation levels are sharply higher, but still below natural background, a researcher saysJapan is still finding high levels of contamination in fish caught near shore (CNN) -- Fish and plankton collected from the Pacific Ocean near the Fukushima Daiichi nuclear power plant contain elevated levels of radioactive materials, but below levels that pose a threat to public health, researchers reported Tuesday.
Levels of the long-lived nuclear waste cesium-137 were 1,000 times higher in seawater samples taken three months after the accident than they were before the meltdowns at Fukushima Daiichi, said Nicholas Fisher, a marine science professor at New York's Stony Brook University. Zooplankton, which get carried by currents, collected in those waters had levels of cesium-137 and the shorter-lived cesium-134 that were on average 40 times higher than the surrounding water, he said. Fukushima tuna study finds miniscule health risks. U.S. researchers say radioactivity in Pacific bluefin tuna that spawned around the Fukushima accident do not pose a health risk.
Scientists linked cesium from Fukushima Daiichi to bluefin tuna in 2011Eating it would give someone about 5% of the dose given off by a banana, scientists sayCesium in Pacific bluefin caught in 2012 dropped by about half (CNN) -- Go ahead, order the sushi. Levels of radioactivity found in Pacific bluefin tuna that spawned off Japan around the time of the Fukushima Daiichi nuclear accident are far below anything that would pose a health risk and have dropped in fish caught the following year, U.S. researchers reported Monday.