Talk:Hafnium controversy

message: The first approximation is installed. --Drac2000 12:21, 4 September 2006 (UTC)
thread_title: Starting discussions

message: The introduction of unsubstantiated rumor and assertions by jjk308 violates the principles of WP:AGF and WP:CON. Such drastic and polarizing edits require discussion WP:DR before such changes are made. The article is being reverted until there is discussion. 
Hey, come on, let's try to talk it out ! --Drac2000 13:02, 11 December 2006 (UTC)
thread_title:  Conflict resolution, Again 

message: An editor may have improved the tone and balance by adding the phrase "It has been claimed...." under the subsection "Opinions." No discussion was given for the change but it seems fair enough. However, 2 minutes later the same colleague edited his own contribution to "Collins claims....", again without discussion. Since the original opinion was  referenced; use of the identity of the writer of the opinion would be better included in the citation rather than the text. For now, I reverted it back to the 2 minutes earlier version. It communicates the message that it is an opinion which we all suspected because it was placed under the subsection "Opinions".  --Drac2000 23:24, 24 January 2007 (UTC)
thread_title:  ...and Again 

message: Wilipedia policy, WP:BURDEN requires verifiability even in a section entitled "Opinions." The following was moved to this talk page from the article because it does not conform to that requirement.
::*Unfortunately, the power needed to liberate a significant amount of the energy might be prohibitively high or might require impossibly close matching of spectral bandwidths between the trigger source and the absorption spectrum of the isomer so that most of the incident power would be absorbed by material's electrons, instead of by its nuclei. 
::*Unfortunately, materials that consist only of nuclei don't exist (except in very special circumstances, e.g., in an Electron Beam Ion Trap, an EBIT, and then only in very low concentrations comparable to a modest vacuum), so that the strong radiation pulse needed to trigger the nuclei would have heated the electrons and blown up the material long before a substantial fraction of the nuclei could have been affected if bandwidths are not closely matched.
::--Drac2000 (talk) 15:59, 30 May 2009 (UTC)
thread_title: Verifiability

message: Our colleague 66.92.144.240, who has no home page onto which to communicate concerns, has a sparse editing history of having made minor touches to Arumer_Zwarte_Hoop and Decapitation during a single day in October, 2008 before attacking this topic in March 2009 and so precisely fits the Disruptive Editing profile. Nevertheless, let’s try a little longer WP:AGF. It is possible that he is attempting to improve this article as opposed to the more evident conclusion that he is a partisan of only one side of the controversy or worse, a practitioner of WP:DE. Hopefully, his prior experience with such topics just did not prepare him for a technical matter. Finally, after so many attempted edits, he has produced what was needed, a verifiable reference. Perhaps, we can help him learn how to function in the Wiki culture. An improvement to his last edit has been attempted.
::--Drac2000 (talk) 15:46, 26 June 2009 (UTC)
thread_title: 66.92.144.240

message: To induce gamma radiation from small amount of this synthetic hafnium isotope various articles state that 300keV synchrotron energy is needed. 300kev synchrotron is a huge facility. Even if it would be possible to construct such tiny Hf lasers to replace existing massive NIF lasers or, let's say, replace fission compression stage of D-T device in warhead, Hf would still have to recieve 300keV or more energy to emmit gamma. This can again come only from large synchrotron facility. At least if the goal is pure fusion.. and given that current published data is not altered by agencies :)  —Preceding unsigned comment added by 89.142.80.38 (talk) 23:50, 23 January 2010 (UTC)
thread_title: How?

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thread_title:  External links modified 

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thread_title:  External links modified 

message: There are are contradictory statements about the specific activity in the article: "1 microgram of 178m2Hf has an activity of 1.5 megabecquerels" (i.e. 1.5 TBq per gram)) and "a gram's natural radioactivity is 1.6 TBq". Both of these contradict the half life of 31 y ,which implies the specific activity is 2.40 TBq/g
(Maths: λ = ln(2)/half-life = 7.085E-10 Bq per atom. This is 7.085E-10 x 6.02214076E23 = 4.267E14 Bq per mole. 1 mole of 178M2Hf is 177.943 g so 1 g would have an activity of 4.267E14 / 177.943 = 2.40 TBq)
1.5 or 1.6 TBq per gram imply a half life of 50 or 46 years, not 31. As the 31 y half-life is well attesetd, and there are no references for the 1.5 and 1.6 TBq/g activities, I will correct the figures to 2.40 TBq/g.
Ewen (talk) 11:43, 26 May 2020 (UTC)
thread_title:  Specific activity vs half life