Villa, Igor MariaIgor MariaVilla0000-0002-8070-8142Holden, N.E.N.E.HoldenPossolo, A.A.PossoloHibbert, D.B.D.B.HibbertIckert, R.B.R.B.IckertRenne, P.R.P.R.Renne2024-10-052024-10-052020https://boris-portal.unibe.ch/handle/20.500.12422/56550The 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.en147Sm half-life146Sm half-life500 - Science::550 - Earth sciences & geology500 - Science::540 - Chemistryarticle10.48350/154859WOS:00055863560000510.1016/j.gca.2020.06.022