emanon

Archaic 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...
Found on http://www.encyclo.co.uk/local/20973

emanon

Type: Term Pronunciation: em′ă-non Definitions: 1. 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, respe...
Found on http://www.medilexicon.com/medicaldictionary.php?t=28473
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