element
Information about Polonium-199:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:198.983595±0.000443amu #
    Excess Mass (Δ):-15.281000±0.412000MeV #
    Binding Energy:1555.757000±0.412000MeV #
    β- Decay Energy:-6.555000±0.354000MeV #
"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: (3/2-)
  • Half life: 5.48 min ( 328.8 sec., λ = 0.00210811 s-1)
  • Mode of decay:
    E.C.
    to
    199
    83
    Bi
      (Q = 5.600 MeV)   Branch ratio: 92.50 %
  • Mode of decay:
    α
    to
    195
    82
    Pb
      (Q = 6.074 MeV)   Branch ratio: 7.50 %
    Meta state at 0.310 Mev
  • Spin: 13/2+ 5.48
  • Half life: 4.17 min ( 250.2 sec., λ = 0.00277037 s-1)
  • Mode of decay:
    E.C.
    to
    199
    83
    Bi
      (Q = 5.910 MeV)   Branch ratio: 73.50 %
  • Mode of decay:
    α
    to
    195
    82
    Pb
      (Q = 6.384 MeV)   Branch ratio: 24.00 %
  • Mode of decay: γ (IT)  (Q = 0.310 MeV)   Branch ratio: 2.50 %

  • Possible parent nuclides:
    α from
    203
    86
    Rn
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
3104.2 m13/2+ 0.99(7) NO/SJP G17 1673 (91)
N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.