Talk:Oxygen-18

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Untitled

8O Oxygen is the first element where the addition of an additional neutron to an EO8O17 isotope with 1 extra neutron results in an EE8O18 isotope that is stable with 2 extra neutrons, rather than in its being converted to a new and stable A=2Z isotope. It is stated that the rest mass plus free energy of the isotope EE8O18 is less than that of the alternative isotope OO9F18 and that therefore an isotope of OO9F18 will spontaneously decay to EE8O18 by positron emission, with a conversion halflife time period of 1.829 hours (=10E+3.818+seconds). It is therefor used internally for positive tomography tests. This evidently involves the internal conversion of a proton into a neutron within the atom as is the case in all the beta+ emission occurrences. In less Zvalue occurrences of this nature the conversion process is that of the added neutron being converted into a proton by a beta- (electron) emission process. The only problem with this in the case of 8O18 is concerned with the possibility that the 8 protons of the atom are already paired with the 8 neutrons to form 8 deuteron pair sub sections of the atom. And the disassociation (unpairing) of a deuteron requires an excitation energy of .002388 amu units(or 2.23 mev). So if the 9th added neutron is unpaired so that it can form stable EE8O18, It also looks like it should also be able to alternatively convert and pair up to form OO9F18 and wind up with a lower 9F18 atomic mass value than that of 8O18. But there is no reported existence of a lower (ground) state of the isotope 9F18 with a lower atomic mass value.WFPM (talk) 02:51, 6 September 2009 (UTC)[reply]

Fixed References and added the T2O 99.49.192.223 (talk) 16:50, 16 April 2010 (UTC)[reply]

How is the largest oxygen-18 plant in the world not notable?

See [1] AccountsPayable (talk) 19:52, 28 July 2015 (UTC)[reply]

Verb needed

The second last paragraph of the article ends with the noun phrase, "A proton beam with energy of 17.5 MeV and beam current of 30 microamperes for 90 minutes." What verb would make this a sentence that is both reliably sourced and relevant to the paragraph? Vaughan Pratt (talk) 18:30, 30 November 2019 (UTC)[reply]

I joined this sentence to the previous one; I think it was an extra detail that got left as a fragment. Now I'll see if I can source this. ComplexRational (talk) 23:02, 30 November 2019 (UTC)[reply]

Incomplete thought in Paleoclimatology's 1st paragraph.

The 1st paragraph in the Paleoclimatology section ends with the sentence: "In the 1950s, Harold Urey performed an experiment in which he mixed both normal water and water with oxygen-18 in a barrel, and then partially froze the barrel's contents." <-- To put it simply, huh? This is incomplete. There is no source to the statement nor is there a reason for it. Urey did that water experiment and ... so? What's the point? What did he find? And why does it relate to the paragraph? 131.91.7.56 (talk) 18:37, 14 November 2024 (UTC)[reply]