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Good articleCobalt 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.
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May 24, 2011Good article nomineeListed

The Leader[edit]

says "Cobalt-60 is a commercially important radioisotope, used as a radioactive tracer and for the production of high energy gamma rays."

My experience of the use of cobalt isotopes is that it is cobalt-57 which is used as a tracer in medical applications, not cobalt-60. In the 1970s and 1980s I designed instruments such as the 'Hydragamma-16' to measure traces of the Cobalt-57 used in radioimmunoassay for B12 measurements for example. Because of its shorter half-life, the specific activity of co57 is much higher than that of co60, and the relatively lower energies of the co57 spectrum also make it easier to measure the activity in vitro using small and thus relatively cheap and efficient well-type scintillation counters. See for example

Well it is true, but it needs one step further in the explanation. Cobalt-60 is used to produce the high energy gamma rays that are used in radiation treatment for cancer. Note that this is of course a completely separate application use than a medical radioactive tracer.


Article changed over to new Wikipedia:WikiProject Elements format by Dwmyers 16:31 Feb 20, 2003 (UTC). Elementbox converted 14:57, 2 July 2005 by Femto (previous revision was that of 00:39, 15 May 2005). 15 May 2005

Information Sources[edit]

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Cobalt. Additional text was taken directly from USGS Cobalt 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. —The preceding unsigned comment was added by Dwmyers (talkcontribs) 16:31, 20 February 2003 (UTC)

K.H.J. BUSCHOW (ed.), Handbook of magnetic materials, volume 12, 1999 Elsevier page 126 for the hcp->fcc transition. —The preceding unsigned comment was added by Marc Tobias Wenzel (talkcontribs) 17:01, 20 May 2003 (UTC)

Image of cobalt metal[edit]

Is the image of cobalt metal included in this article really cobalt? I looked online for more images of Cobalt metal and all the other pictures I have seen look much more silvery and much less golden.

Hey Guys

In medical uses of cobalt you should mention its use as an Implant material. Its used as for dental implants when alloyed with chromium and molybdenum, refered to as "CoCrMo" in scientific journals or "Vitalium" as a tradename



Cobalt Poisining of firefighters due to a lithium battery fire[edit]

In Victoria (Australia), two firefighters have been permanently disabled as a result of heavy metal poisoning when they absorbed cobalt compounds from a lithium battery fire. Unfortunately, I have no further details, which is why I havent added this to the main article. 2001:8003:E490:7D01:70EE:4AFD:8B72:B12F (talk) 06:11, 17 March 2023 (UTC)Reply[reply]