Villa, Igor M.; Holden, Norman E.; Possolo, Antonio; Ickert, Ryan Ben; Hibbert, David Brynn; Renne, Paul R.; Bonardi, Mauro L.; De Bièvre, Paul (2022). IUGS–IUPAC recommendations and status reports on the half-lives of 87 Rb, 146 Sm, 147 Sm, 234 U, 235 U, and 238 U (IUPAC Technical Report). Pure and applied chemistry, 94(9), pp. 1085-1092. De Gruyter 10.1515/pac-2021-1202
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The IUPAC–IUGS joint Task Group “Isotopes in Geosciences” (TGIG) has evaluated the published literature on the half-lives of six long-lived, geologically relevant radioactive nuclides. Where conflicting literature estimates are present, it is necessary to first identify any systematic bias in accordance with metrological traceability and to exclude the biased estimates from further consideration. The TGIG recommends three robust half-life estimates: 49.61±0.16 Ga for 87Rb, corresponding to a decay constant λ(87Rb) = (1.3972±0.0045)×10–11 a–1; 106.25±0.38 Ga for 147Sm, and a corresponding decay constant λ(147Sm) = (6.524±0.024)×10–12 a–1; 4.4683±0.0096 Ga for 238U, i.e. a decay constant λ(238U) = (1.55125±0.00333)×10–10 a–1. All cited uncertainties have a coverage factor k = 2. For other radionuclides of Sm and U no unambiguous consensus value can be endorsed at present by TGIG, which limits its evaluation to a status report highlighting unaccounted-for potential sources of bias. The improved repeatability of mass spectrometric measurements has revealed systematic bias effects that had been dismissed as subordinate in the past. These issues can only be resolved by future dedicated investigations.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
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 500 Science > 540 Chemistry |
ISSN: |
0033-4545 |
Publisher: |
De Gruyter |
Funders: |
[UNSPECIFIED] International Union of Pure and Applied Chemistry ; [UNSPECIFIED] International Union of Geological Sciences |
Projects: |
[UNSPECIFIED] IUPAC grant no. 2012-036-2-200
[UNSPECIFIED] IUGS grant no. IUGS-201-TGIG |
Language: |
English |
Submitter: |
Igor Maria Villa-Toscani |
Date Deposited: |
23 Jan 2023 08:15 |
Last Modified: |
23 Jan 2023 23:28 |
Publisher DOI: |
10.1515/pac-2021-1202 |
Uncontrolled Keywords: |
half-life, decay constants, 87Rb, 146Sm, 147Sm, 234U, 235U, 238U |
BORIS DOI: |
10.48350/176710 |
URI: |
https://boris.unibe.ch/id/eprint/176710 |
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