By 2016, nearly as much radiation from the Fukushima disaster will have reached the North American West Coast as was initially scattered over Japan during the nuclear explosions, according to professor Michio Aoyama of Japan's Fukushima University Institute of Environmental Radioactivity.
In March 2011, a massive earthquake and tsunami triggered multiple nuclear meltdowns at Japan's Fukushima Daiichi nuclear power plant. A massive cloud of radiation was ejected into the atmosphere, settling all across Japan and into the Pacific Ocean.
Approximately 800 terabecquerels' worth of cesium-137 (Cs-137) alone is expected to reach North America by next year, accounting for just 5 percent of the Cs-137 spilled into the ocean as a result of the disaster.
Radioactivity already arriving
Radioactive cesium does not naturally occur on planet Earth and is found only as a result of human nuclear activities. Cs-137 is widely considered one of the most dangerous byproducts of nuclear activity, because it mimics the activity of potassium and therefore accumulates in soil and plants, and is actively taken up by the human body.
