# Talk:Actinium

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.
— Preceding unsigned comment added by 24.103.109.9 (talk • contribs) 

This review available through the wikipedia library, might be useful:

Kirby, H. W.; Morss, Lester R. (2010). Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). Actinium. Dordrecht: Springer Netherlands. pp. 18–51. doi:10.1007/978-94-007-0211-0_2. ISBN 978-94-007-0210-3.
Johnjbarton (talk) 20:34, 14 April 2024 (UTC)

Both are trivalent, and even have similar half-lives (17.7 years vs 21.772 years). :) 2A04:CEC0:C002:1BBB:6D1B:728:ADF0:27C8 (talk) 07:12, 2 February 2025 (UTC)

If this pairing is notable, a source will explain why. Johnjbarton (talk) 17:11, 2 February 2025 (UTC)
Moreover, it's just a coincidence that the longest-lived isotopes of Pm and Ac have half-lives of the same order of magnitude. Complex/Rational 17:19, 2 February 2025 (UTC)