IUGS-IUPAC recommendation on the half-lives of 147Sm and 146Sm

Villa, I.M.; Holden, N.E.; Possolo, A.; Hibbert, D.B.; Ickert, R.B.; Renne, P.R. (2020). IUGS-IUPAC recommendation on the half-lives of 147Sm and 146Sm. Geochimica et cosmochimica acta, 285, pp. 70-77. Elsevier Science 10.1016/j.gca.2020.06.022

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The IUPAC-IUGS joint Task Group “Isotopes in Geosciences” recommends a value of (106.25 ± 0.38) Ga for the half-life of 147Sm, and a corresponding decay constant λ147 = (6.524 ± 0.024) × 10-12 a-1, both with a coverage factor k = 2. For the extinct radionuclide 146Sm two very different half-lives are used in the scientific community (c. 68 and 103 Ma), to such a degree that no consensus value can be endorsed at present by the Task Group. Pending dedicated re-investigations it is recommended that papers using the 146Sm decay to quantify the cosmo/geological evolution of (extra)terrestrial samples perform a twin set of calculations using both proposed half-lives.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Isotope Geology

UniBE Contributor:

Villa, Igor Maria

Subjects:

500 Science > 550 Earth sciences & geology
500 Science > 540 Chemistry

ISSN:

0016-7037

Publisher:

Elsevier Science

Funders:

[UNSPECIFIED] IUPACInternational Union of Pure and Applied Chemistry ; [UNSPECIFIED] International Union of Geological Sciences

Language:

English

Submitter:

Igor Maria Villa-Toscani

Date Deposited:

15 Apr 2021 08:54

Last Modified:

17 Apr 2021 06:46

Publisher DOI:

10.1016/j.gca.2020.06.022

Web of Science ID:

WOS:000558635600005

Uncontrolled Keywords:

147Sm half-life, 146Sm half-life

BORIS DOI:

10.48350/154859

URI:

https://boris.unibe.ch/id/eprint/154859

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