Definition: Obsolete term once used to denote all radon isotopes collectively, when the term radon was restricted to the isotope radon-222, the naturally occurring intermediate of the uranium-238 radioactive series; so called because original names for radon-219, radon-220, and radon-222 were, respectively, “actinium emanation,” “thorium emanation,” and “radium emanation.”
[L. emano, to flow out + -on]
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