Tl

Thallium-204m

Protons (Z)

81

Neutrons (N)

123

Mass number

204

Half-Life

61.7 µs

Abundance

---

Mass

203.975 u

Mass Excess

-23,242.0 keV

Spin

7+

Discovered

1972

Binding energy per nucleon

7,875 keV

Neutron separation energy

5,552 keV

Proton separation energy

5,262 keV

Decay Mode

γThallium-204100%

Decay chain

Thallium-204Z 81 · N 12361.7 µs
γ100%
β⁻97.08%