Vital articles: Level 4 / Physical sciences GA‑class
Actinium has been listed as a level-4 vital article in Science (Physics). If you can improve it, please do.Vital articlesWikipedia:WikiProject Vital articlesTemplate:Vital articlevital articles  GA This article has been rated as GA-class on Wikipedia's content assessment scale.

	Actinium 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.
	Actinium 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 Date Process Result August 10, 2011 Good article nominee Listed September 29, 2014 Good topic candidate Promoted
Current status: Good article

This article is of interest to the following WikiProjects:

Elements GA‑class Mid‑importance This article is supported by WikiProject Elements, which gives a central approach to the chemical elements and their isotopes on Wikipedia. Please participate by editing this article, or visit the project page for more details.ElementsWikipedia:WikiProject ElementsTemplate:WikiProject Elementschemical elements articles  GA This article has been rated as GA-class on Wikipedia's content assessment scale.  Mid  This article has been rated as Mid-importance on the importance scale.

Archives

Archive 1

Sections older than 730 days may be automatically archived.

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

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 [http://www.dict.org dict.org), Webster's Revised Unabridged Dictionary (1913) (via dict.org) and WordNet (r) 1.7 (via dict.org). 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.

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.