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Related to actinon: radium emanation


A radioactive isotope of radon, Rn-219, having a half-life of 3.96 seconds and produced by the disintegration of actinium.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Elements & Compounds) a radioisotope of radon that is a decay product of radium. Symbol: An or 219Rn; atomic no: 86; half-life: 3.92s
2. (Elements & Compounds) another name for actinide
[C20: New Latin, from actinium + -on]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈæk təˌnɒn)

a chemically inert, gaseous, short-lived isotope of radon. Symbol: An; at. no.: 86; at. wt.: 219.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.actinon - any of a series of radioactive elements with atomic numbers 89 through 103actinon - any of a series of radioactive elements with atomic numbers 89 through 103
group, grouping - any number of entities (members) considered as a unit
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References in periodicals archive ?
Radon (222Rn), thoron (220Rn) and actinon (219Rn) are the three commonly occurring natural isotopes of radon gas.
When we talk about radon in many resources [sup.222]Rn is considered and two other isotopes are known in the name of Torun and Actinon. [sup.222]Rn isotope has enough time to remain in the weather of human environment due to half-life of 3.8 days and causes some threats for human health including lung cancer.