Tl

Thallium-209m

Protons (Z)

81

Neutrons (N)

128

Mass number

209

Half-Life

146.0 ns

Abundance

---

Mass

208.987 u

Mass Excess

-12,417.0 keV

Spin

17/2+

Discovered

2009

Binding energy per nucleon

7,828 keV

Neutron separation energy

3,738 keV

Proton separation energy

6,436 keV

Decay Mode

γThallium-209100%

Decay chain

Thallium-209Z 81 · N 128146.0 ns
γ100%
β⁻100%
β⁻100%
α100%