Radiocesium is soluble in water, and plants can mistake it for potassium, a vital nutrient that shares similar chemical properties. east coast, thanks to regional wind and rainfall patterns. For example, far more fallout dusted the U.S. The bombs ejected radiocesium-a radioactive form of the element cesium-into the upper atmosphere, and winds dispersed it around the world before it fell out of the skies in microscopic particles. In the wake of World War II, the United States, the former Soviet Union, and other countries detonated hundreds of nuclear warheads in aboveground tests. The study, he says, shows that the fallout "is still out there and disguising itself as a major nutrient." "It's really quite incredible," says Daniel Richter, a soil scientist at Duke University not involved with the work. Although the levels of radioactivity aren't dangerous, they may have been much higher in the 1970s and '80s, researchers say. Fallout from nuclear bomb tests in the 1950s and '60s is showing up in U.S.
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