element
Information about Actinium-208:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:208.011485±0.000223amu #
    Excess Mass (Δ):10.698000±0.207000MeV #
    Binding Energy:1598.508000±0.207000MeV #
"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.
Radioactive Decay Data:

  • Spin: (3+)
  • Half life: 95 ms ( 0.095 sec., λ = 7.29629 s-1)
  • Mode of decay:
    α
    to
    204
    87
    Fr
      (Q = 7.720 MeV)   Branch ratio: ~99.00 %
    Meta state at 0.506 Mev
  • Spin: (10-) 95
  • Half life: 25 ms ( 0.025 sec., λ = 27.7259 s-1)
  • Mode of decay:
    α
    to
    204
    87
    Fr
      (Q = 8.226 MeV)   Branch ratio: ~90.00 %
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)