Tl

Thallium-199m

Protons (Z)

81

Neutrons (N)

118

Mass number

199

Half-Life

28.4 ms

Abundance

---

Mass

198.971 u

Mass Excess

-27,310.0 keV

Spin

9/2-

Discovered

1963

Binding energy per nucleon

7,890 keV

Neutron separation energy

7,852 keV

Proton separation energy

3,645 keV

Decay Mode

γThallium-199100%

Decay chain

Thallium-199Z 81 · N 11828.4 ms
γ100%
β⁺100%