200
85
At
element 		Information about Astatine-200:

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

    Atomic Mass:199.990293±0.000222amu #
    Excess Mass (Δ):-9.042000±0.207000MeV #
    Binding Energy:1556.807000±0.207000MeV #
    β- Decay Energy:-5.016000±0.274000MeV #
"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: 43 s ( 43 sec., λ = 0.0161197 s-1)
  • Mode of decay:
    α
     to
    196
    83
    Bi
       (Q = 6.596 MeV)   Branch ratio: 57.00 %
  • Mode of decay:
    E.C.
     to
    200
    84
    Po
       (Q = 7.970 MeV)   Branch ratio: 43.00 %
    Meta state at 0.104 Mev
  • Spin: (7+) 43
  • Half life: 47 s ( 47 sec., λ = 0.0147478 s-1)
  • Mode of decay:
    E.C.
     to
    200
    84
    Po
       (Q = 8.074 MeV)   Branch ratio: <=57.00 %
  • Mode of decay:
    α
     to
    196
    83
    Bi
       (Q = 6.700 MeV)   Branch ratio: 43.00 %
    Meta state at 0.335 Mev
  • Spin: (10-) 47
  • Half life: 3.5 s ( 3.5 sec., λ = 0.198042 s-1)
  • Mode of decay: γ (IT) to
    200
    85
    At
       (Q = 0.335 MeV)   Branch ratio: ~84.00 %
  • Mode of decay:
    α
     to
    196
    83
    Bi
       (Q = 6.931 MeV)   Branch ratio: ~10.50 %
  • Mode of decay:
    E.C.
     to
    200
    84
    Po
       (Q = 8.305 MeV)   Branch ratio: ~4.50 %

  • Possible parent nuclides:
    α from
    204
    87
    Fr
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)