| General | |
|---|---|
| Symbol | 147Sm |
| Names | Samarium-147, 147Sm, Sm-147 |
| Protons (Z) | 62 |
| Neutrons (N) | 85 |
| Nuclide data | |
| Natural abundance | 15.00% |
| Half-life (t1/2) | 1.06×1011 years |
| Isotope mass | 146.9148979(26) Da |
| Spin | 7/2− |
| Parent isotopes | 147Pm (β−) 151Gd (α) |
| Decay products | 143Nd |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| Isotopes of samarium Complete table of nuclides | |
Samarium-147 (147Sm or Sm-147) is an isotope of samarium, making up 15% of natural samarium. It is an extremely long-lived radioisotope, with a half-life of 1.06×1011 years, although measurements have ranged from 1.05×1011 to 1.17×1011 years.[1][2] It is mainly used in radiometric dating.[3]
- ^ Wright, P. M.; Steinberg, E. P.; Glendenin, L. E. (1961-07-01). "Half-Life of Samarium-147". Physical Review. 123 (1): 205–208. Bibcode:1961PhRv..123..205W. doi:10.1103/PhysRev.123.205.
- ^ Kinoshita, Norikazu; Yokoyama, Akihiko; Nakanishi, Takashi (2003). "Half-Life of Samarium-147". Journal of Nuclear and Radiochemical Sciences. 4 (1): 5–7. doi:10.14494/jnrs2000.4.5. S2CID 120606011.
- ^ Currie, Lloyd A., ed. (1982-01-29). Nuclear and Chemical Dating Techniques: Interpreting the Environmental Record. ACS Symposium Series. Vol. 176. WASHINGTON, D. C.: AMERICAN CHEMICAL SOCIETY. doi:10.1021/bk-1982-0176.ch001. ISBN 978-0-8412-0669-4.