Talk:Hafnium

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Article changed over to new Wikipedia:WikiProject Elements format by maveric149 and Dwmyers. Elementbox converted 10:58, 14 July 2005 by Femto (previous revision was that of 16:28, 10 July 2005).

[edit] Information Sources

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Hafnium. Additional text was taken directly from, from the Elements database 20001107 (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.

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[edit] Talk

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Thanks to all who are recently contributing to making this page even better. --Drac2000 13:17, 20 September 2006 (UTC)

[edit] Energies

The phrase "The nuclear isomer Hf-178-m2 is also a source of energetic, 2.45 MeV gamma rays." is utterly wrong as this nucleus can never emit a gamma with energy more than 0.5 MeV with non-negligible probability. (source: http://ie.lbl.gov/toi/nuclide.asp?iZA=720778 ). Actual gamma energy is 12.7 and 309 KeV for transition from that long-living level with exitation energy of 2446.05 KeV and halflife of 31 years (because transition is done to nearby levels with exitation energies 2433.326 and 2136.513 KeV), and is in range from 89 to 574 KeV for transitions from other levels. —The preceding unsigned comment was added by 85.21.179.36 (talk • contribs) .

Tagged as dubious in the article. You seem to know what you're talking about, be BOLD and fix it! Femto 11:50, 16 November 2006 (UTC)

Thanks for the contribution as it illuminated a shortcoming of the existing text. However, from the reference link you cite above, under the section titled "Most Recent ENSDF Data (12/2002)" if you take the link available from the button marked "Level scheme" you will see that the two gamma transitions that you correctly say start from the isomer finish on energy levels that then emit more gammas in a sequential cascade. Elsewhere it is reported that each decay of an isomer on the average results in thesequential emission of 8 gamma photons (more or less) but the energies total to about 2.446 MeV. The use of about is because some of the less energetic members of the cascade are sometimes internally converted and some small part of the 2.45 MeV of the isomer ends up in electron energies. However, most of the stored energy ends up in sequences of gammas whose summed energies is almost up to 2.45 MeV. I have edited the entry to try to make this point that you have raised completely clear.

--Drac2000 22:00, 16 November 2006 (UTC)