Sentences with phrase «radioactivity diminishes»
It was at Russia's State Atomic Energy Corporation, where it will remain, encased in steel and concrete, until May 21, 3015, when its radioactivity diminishes to a safe level.
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The technique relies on the radioactive isotope carbon - 14, whose radioactivity diminishes over time in a predictable manner, allowing researchers to calculate the age of ancient human sites using charcoal from fires or the bones of the prehistoric humans themselves.