Sentences with phrase «where natural radioactivity»
The element later turned up in uranium ore deposits, where natural radioactivity can produce traces of plutonium.
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The natural radioactivity of the Marcellus Shale has caused concern since the mid-1980s, when high levels of radon gas were found in the basements of homes in Marcellus, a town in upstate New York, where the shale reaches the surface.