Isotopes of yttrium
| ||||||||||||||||||||||||||||||||||||
| Standard atomic weight Ar°(Y) | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Natural yttrium (39Y) is composed of a single isotope, yttrium-89. The most stable radioisotopes are 88Y, which has a half-life of 106.63 days, and 91Y, with a half-life of 58.51 days. All the other isotopes have half-lives of less than 15 hours, except 87Y with 79.8 hours and 90Y with 64.05 hours. The dominant decay mode below the stable 89Y is electron capture and the dominant mode after it is beta emission. Isotopes characterized range from 76Y to 109Y.
In products of nuclear fission, 90Y exists in equilibrium with its parent isotope strontium-90. This isotopes alone has also been used in medicine; see yttrium-90.
- ^ "Standard Atomic Weights: Yttrium". CIAAW. 2021.
- ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.