Actinium emanation



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a chemically inert, gaseous, short-lived isotope of radon that is a member of the . Symbol: An; atomic number: 86; atomic weight: 219.
Historical Examples

These are generally known as radium emanation, thorium emanation, and actinium emanation.
A Brief Account of Radio-activity Francis Preston Venable

noun
a radioisotope of radon that is a decay product of radium. Symbol: An or 219Rn; atomic no: 86; half-life: 3.92s
another name for actinide

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    a combining form with the meaning “ray, beam,” used in the formation of compound words, with the particular senses “radiation” in the physical sciences (actinometer) and “having raylike structures,” “radiate in form” in biology (actinomyces; actinopod). combining form indicating a radial structure: actinomorphic indicating radioactivity or radiation: actinometer before vowels actin-, word-forming element meaning “pertaining […]



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