SALEM, Ore. -- For the first time, seaborne radiation from Japan's Fukushima nuclear disaster has been detected on the West Coast of the United States. Cesium-134, the so-called fingerprint of Fukushima, was measured in seawater samples taken from Tillamook Bay and Gold Beach in Oregon, according to researchers from the Woods Hole Oceanographic Institution. Because of its short half-life, cesium-134 can only have come from Fukushima. For the first time, cesium-134 has also been detected in a Canadian salmon, according to the Fukushima InFORM project, led by University of Victoria chemical oceanographer Jay Cullen. Related: How much should we be worried about Fukushima radiation? Experts weigh in Should we be worried? In both cases, levels are extremely low, the researchers said, and don't pose a danger to humans or the environment. Massive amounts of contaminated water were released from the crippled nuclear plant following a 9.0 magnitude earthquake and tsunami in March 2011. More radiation was released to the air, then fell to the sea. Woods Hole chemical oceanographer Ken Buesseler runs a crowd-funded, citizen science seawater sampling project that has tracked the radiation plume as it slowly makes its way across the Pacific Ocean. The Oregon samples, marking the first time cesium-134 has been detected on U.S. shores, were taken in January and February of 2016 and later analyzed. They each measured 0.3 becquerels per cubic meter of cesium-134. Buesseler's team previously had found the isotope in a sample of seawater taken from a dock on Vancouver Island, B.C., marking its landfall in North America. USA TODAY In Canada, Cullen leads the InFORM project to assess radiological risks to that country's oceans following the nuclear disaster. It is a partnership of a dozen academic, government and non-profit organizations.