Th

Thorium-229

Protons (Z)

90

Neutrons (N)

139

Mass number

229

Half-Life

7.92 ky

Abundance

---

Mass

229.032 u

Mass Excess

29,585.5 keV

Spin

5/2+

Discovered

1947

Binding energy per nucleon

7,635 keV

Neutron separation energy

5,257 keV

Proton separation energy

6,598 keV

Decay Mode

αRadium-225100%

Decay chain

Thorium-229Z 90 · N 1397.92 ky
α100%
β⁻100%
α~100%
α~100%
α99.992%
β⁻97.91%
α100%
β⁻100%
α100%