202
85
At
element 		Information about Astatine-202:

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    Mass-Energy Data:

    Atomic Mass:201.988449±0.000193amu
    Excess Mass (Δ):-10.760031±0.180202MeV
    Binding Energy:1574.667199±0.180202MeV
    β- Decay Energy:-4.442000±0.236000MeV #
"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: (2,3)+
  • Half life: 184 s ( 184 sec., λ = 0.0037671 s-1)
  • Mode of decay:
    E.C.
     to
    202
    84
    Po
       (Q = 7.210 MeV)   Branch ratio: 82.00 %
  • Mode of decay:
    α
     to
    198
    83
    Bi
       (Q = 6.354 MeV)   Branch ratio: 18.00 %
    Meta state at 0.000 Mev
  • Spin: (7+) 184
  • Half life: 182 s ( 182 sec., λ = 0.0038085 s-1)
  • Mode of decay:
    E.C.
     to
    202
    84
    Po
       (Q = 7.210 MeV)   Branch ratio: 91.30 %
  • Mode of decay:
    α
     to
    198
    83
    Bi
       (Q = 6.354 MeV)   Branch ratio: 8.70 %
    Meta state at 0.391 Mev
  • Spin: (10-) 182
  • Half life: 0.46 s ( 0.46 sec., λ = 1.50684 s-1)
  • Mode of decay: γ (IT) to
    202
    85
    At
       (Q = 0.392 MeV)   Branch ratio: 99.70 %
  • Mode of decay:
    E.C.
     to
    202
    84
    Po
       (Q = 7.602 MeV)   Branch ratio: 0.25 %
  • Mode of decay:
    α
     to
    198
    83
    Bi
       (Q = 6.746 MeV)   Branch ratio: 0.10 %

  • Possible parent nuclides:
    E.C. from
    202
    86
    Rn
    α from
    206
    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)