![]() Cesium-134, with a half-life of only two years, is an unequivocal marker of Fukushima ocean contamination, Smith said. Cesium-137 has a half-life of 30 years and remains in the environment for decades. The initial nuclear accident from the Fukushima reactors released several radioactive isotopes, such as iodine-131, cesium-134 and cesium-137. The meltdown was triggered by the massive tsunami that followed the quake. Three nuclear reactors at the power plant melted down after the March 11, 2011, Tohoku earthquake. The scientists are tracking a radioactive plume from Japan's Fukushima Daiichi nuclear power plant. ![]() In this case, cesium-137 has more neutrons than cesium-134.) (Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei. "We have results from eight locations, and they all have cesium-137, but no cesium-134 yet," Buesseler said. ![]() beaches indicate that Fukushima radioactivity has not yet reached Washington, California or Hawaii, said Ken Buesseler, a senior scientist at the Woods Hole Oceanographic Institute in Woods Hole, Mass. The detected concentrations are much lower than the Canadian safety limit for cesium levels in drinking water, said John Smith, a research scientist at Canada's Bedford Institute of Oceanography in Dartmouth, Nova Scotia. ![]() Two radioactive cesium isotopes, cesium-134 and cesium-137, have been detected offshore of Vancouver, British Columbia, researchers said at a news conference. Radiation from Japan's leaking Fukushima nuclear power plant has reached waters offshore Canada, researchers said today at the annual American Geophysical Union's Ocean Sciences Meeting in Honolulu. ![]()
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