IUPAC-IUGS recommendation on the half-lives of 147Sm and 146Sm
| Autor: | A. Possolo, D.B. Hibbert, Norman E. Holden, Ryan B. Ickert, Paul R. Renne, Igor M. Villa |
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| Rok vydání: | 2020 |
| Předmět: |
Task group
Information retrieval 010504 meteorology & atmospheric sciences Geological evolution Extinct radionuclide Chemical nomenclature 010502 geochemistry & geophysics 01 natural sciences Set (abstract data type) Geochemistry and Petrology Magma ocean Coverage factor 0105 earth and related environmental sciences Mathematics |
| Zdroj: | Geochimica et Cosmochimica Acta. 285:70-77 |
| ISSN: | 0016-7037 |
| DOI: | 10.1016/j.gca.2020.06.022 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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