Samarium-147

Samarium-147, 147Sm
General
Symbol147Sm
NamesSamarium-147, 147Sm, Sm-147
Protons (Z)62
Neutrons (N)85
Nuclide data
Natural abundance15.00%
Half-life (t1/2)1.06×1011 years
Isotope mass146.9148979(26) Da
Spin7/2−
Parent isotopes147Pm (β−)
151Gd (α)
Decay products143Nd
Decay modes
Decay modeDecay 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]

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.