43-Tc-99
 basic
 fission yield
 n-XS summary
 XS graphs

 element
43-technetium-99

Technetium-99m is the most widely used radioactive isotope for diagnostic studies in nuclear medicine. Different chemical forms are used for brain, bone, liver, spleen and kidney imaging and also for blood flow studies.
  • Atomic Mass: 98.9062546 +- 0.0000021 amu
  • Excess Mass: -87323.307 +- 1.916 keV
  • Binding Energy: 852743.069 +- 1.921 keV
  • Beta Decay Energy: B- 293.651 +- 1.417 keV
"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.
  • Spin: 9/2+
  • Half life: 211100 years
  • Mode of decay: Beta to Ru-99
    • Decay energy: 0.294 MeV

    Meta state at 0.143 Mev
  • Spin: 1/2-
  • Half life: 6.01 h
  • Mode of decay: IT
    • Decay energy: 0.143 MeV
  • Mode of decay: Beta to Ru-99
    • Branch ratio: 0.0037 %
    • Decay energy: 0.437 MeV

  • Possible parent nuclides:
    Beta from Mo-99
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
02.1x10*5y9/2+ +5.6847(4) [2H]NPR 85 479 (52)
-0.129(6) ABBk82HFS 83 (82)
1410.205 ns7/2+ +4.48(15) IPACZP A347 1 (93)
3.6(9) [99Tc]MEJP A6 L144 (73)
+4.4(9) IPACPR 188 605 (69)
1813.44 ns5/2+ 3.48(4) NMR/ONZP A350 311 (95)
+3.62(5) IPACZP A347 1 (93)
+3.29(6) TDPACZP 243 166 (71)
N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.