90-Th-221
 basic

 element
90-thorium-221

  • Atomic Mass: 221.0181715 +- 0.0000112 amu
  • Excess Mass: 16926.640 +- 10.429 keV
  • Binding Energy: 1696423.894 +- 10.433 keV
  • Beta Decay Energy: B- -3439.301 +- 52.548 keV
"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.
  • Spin: (7/2+)
  • Half life: 1.68 ms
  • Mode of decay: Alpha to Ra-217
    • Decay energy: 8.628 MeV

  • Possible parent nuclides:
    Alpha from U-225
R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)