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Good articleActinium has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.
Good topic starActinium is part of the Actinides series, a good topic. This is identified as among the best series of articles produced by the Wikipedia community. If you can update or improve it, please do so.
Article milestones
August 10, 2011Good article nomineeListed
September 29, 2014Good topic candidatePromoted
Current status: Good article


Article changed over to new Wikipedia:WikiProject_Elements format by Mav, Mkweise, and Dwmyers 15:40 Feb 28, 2003 (UTC). Elementbox converted 10:26, 17 July 2005 by Femto (previous revision was that of 07:26, 13 July 2005). 07:26, 13 July 2005

Information Sources[edit]

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Actinium. Additional text was taken directly from USGS Actinium Statistics and Information, from the Elements database 20001107 (via [, Webster's Revised Unabridged Dictionary (1913) (via and WordNet (r) 1.7 (via Data for the table was obtained from the sources listed on the subject page and Wikipedia:WikiProject_Elements but was reformatted and converted into SI units.

Hypothetical Application of Actinium[edit]

In principle, actinium 227 could be used as a source of thermoelectric power. It has a half life of 21.773 years and emits approximatly 56 J/s per gram of actinium 227 (this calculated energy release takes into account decay produts at equlibrum, assumes no gamma rays, assumes all alpha rays emmited have the same energy, and that all beta rays emitted have the same energy).

Actually, the energy emmitted per gram of actinium in equilibrum can be calculated to be approximatly 10 watts per gram with improved data, but this is still approximate and uncertain.