222
89
Ac
element 		Information about Actinium-222:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation
    Mass-Energy Data:

    Atomic Mass:222.017829±0.000006amu
    Excess Mass (Δ):16.607466±0.005818MeV
    Binding Energy:1705.596745±0.005826MeV
    β- Decay Energy:-0.582444±0.013550MeV
"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: 1-
  • Half life: 5.0 s ( 5 sec., λ = 0.138629 s-1)
  • Mode of decay:
    α
     to
    218
    87
    Fr
       (Q = 7.137 MeV)   Branch ratio: 99.00 %
  • Mode of decay: E.C. to
    222
    88
    Ra
       (Q = 2.298 MeV)   Branch ratio: 1.00 %
    Meta state at 0.000 Mev 5.0
  • Half life: 63 s ( 63 sec., λ = 0.0110023 s-1)
  • Mode of decay:
    α
     to
    218
    87
    Fr
       (Q = 7.137 MeV)   Branch ratio: >=88.00 %
  • Mode of decay: γ (IT) to
    222
    89
    Ac
       Branch ratio: <=10.00 %
  • Mode of decay: E.C. to
    222
    88
    Ra
       (Q = 2.298 MeV)   Branch ratio: >=0.70 %

  • Possible parent nuclides:
    α from
    226
    91
    Pa
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)