217
89
Ac
element 		Information about Actinium-217:

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

    Atomic Mass:217.009333±0.000014amu
    Excess Mass (Δ):8.693330±0.013026MeV
    Binding Energy:1673.154266±0.013029MeV
    β- Decay Energy:-3.477726±0.031662MeV
"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: 9/2-
  • Half life: 69 ns ( 6.9×10+10 sec., λ = 1.00456×10-11 s-1)
  • Mode of decay: E.C. to
    217
    88
    Ra
       (Q = 2.819 MeV)   Branch ratio: <=2.00 %
    Meta state at 1.528 Mev
  • Spin: 21/2- 69
  • Half life: <10 ns ( 0 sec., λ = inf s-1)
  • Mode of decay: γ (IT) to
    217
    89
    Ac
       (Q = 1.528 MeV)   Branch ratio: >=99.60 %
  • Mode of decay:
    α
     to
    213
    87
    Fr
       (Q = 11.360 MeV)   Branch ratio: <=0.48 %
    Meta state at 2.013 Mev
  • Spin: 29/2)+ <10
  • Half life: 740 ns ( 7.4×10+11 sec., λ = 9.36685×10-13 s-1)
  • Mode of decay: γ (IT) to
    217
    89
    Ac
       (Q = 2.013 MeV)   Branch ratio: 95.70 %
  • Mode of decay:
    α
     to
    213
    87
    Fr
       (Q = 11.845 MeV)   Branch ratio: 4.30 %

  • Possible parent nuclides:
    α from
    221
    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)
Magnetic Dipole Moments and Electric Quadrupole Moments
Ex(kev)T1/2Spin    m(nm)    Q(b)    Ref. Std.MethodReference
069 ns9/2- +3.83(5) TDPADNP A436 311 (85)
2013740 ns29/2+ +5.03(70 TDPADNP A436 311 (85)
N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.