Thorium-232 (Th-232)
Identity
- Protons
- 90
- Neutrons
- 142
- Mass number
- 232
- Mass
- 232.0 ± 1.5 u
- Mass excess
- 35.447 MeV
- Spin
- 0+
Stability
Half-life: 1.40 × 10¹⁰ years
Natural occurrence
99.98 % of thorium
Decays to
- alpha 100.0 % Ra-228
- spontaneous fission 1.1e-9 %