Light mass elements total half-lives for selected long-lived nuclides

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In the past, many compilations and evaluations of half-lives have been made which have uncritically accepted authors' values and uncertainties. They have merely recommended weight-averaged reported results. This evaluation attempts to reanalyze each experiment in the literature including an estimate of the standard deviation utilizing, where possible, an estimate of the systematic error. This paper constitutes a preliminary step in the process of recommending values. The long-lived nuclides of light elements are of interest for their use in dating methods and for calculating cosmic-ray exposure ages of meteorites. Experimental data on the half-lives of selected nuclides have been evaluated and ... continued below

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Pages: 12

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Holden, N.E. January 1, 1985.

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Description

In the past, many compilations and evaluations of half-lives have been made which have uncritically accepted authors' values and uncertainties. They have merely recommended weight-averaged reported results. This evaluation attempts to reanalyze each experiment in the literature including an estimate of the standard deviation utilizing, where possible, an estimate of the systematic error. This paper constitutes a preliminary step in the process of recommending values. The long-lived nuclides of light elements are of interest for their use in dating methods and for calculating cosmic-ray exposure ages of meteorites. Experimental data on the half-lives of selected nuclides have been evaluated and recommended values and uncertainties are presented for the following nuclides: /sup 3/H, /sup 10/Be, /sup 14/C, /sup 26/Al, /sup 39/Ar, /sup 40/K, /sup 50/V, /sup 53/Mn, /sup 76/Ge, /sup 87/Rb, /sup 92/Nb, /sup 107/Pd, /sup 113/Cd, /sup 115/In and /sup 123/Te. The impact of the recommended /sup 14/C half-life of 5715 years on the carbon dating technique, which uses the Libby value of 5568 years, will be discussed. Also the possible primordial occurrence of /sup 92/Nb is now definitely ruled out by the recommended half-life of 3.7 x 10/sup 7/. Finally, based on the recommended /sup 26/Al half-life value, the /sup 21/Ne production rate for calculating cosmic-ray exposure ages remains too high, compared to rates using the /sup 53/Mn and /sup 10/Be half-life values. 15 tabs.

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Pages: 12

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NTIS, PC A02/MF A01.

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  • International Committee for Radionuclide Metrology meeting, Grenoble, France, 3 Jun 1985

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  • Other: DE85014217
  • Report No.: BNL-NCS-36553
  • Report No.: CONF-8506130-4
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5400477
  • Archival Resource Key: ark:/67531/metadc1064331

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  • January 1, 1985

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 23, 2018, 4:32 p.m.

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Holden, N.E. Light mass elements total half-lives for selected long-lived nuclides, article, January 1, 1985; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1064331/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.