Ac
Actinium-231
Protons (Z)
89
Neutrons (N)
142
Mass number
231
Half-Life
7.5 m
Abundance
---
Mass
231.038 u
Mass Excess
35,763.0 keV
Spin
1/2+
Discovered
1973
Binding energy per nucleon
7,615 keV
Neutron separation energy
6,146 keV
Proton separation energy
6,042 keV
Decay Mode
- β⁻→Thorium-231100%
Decay chain
- AcActinium-231Z 89 · N 1427.5 m
- β⁻100%
- β⁻100%
- α~100%
- β⁻98.62%
- α100%
- α~100%
- α100%
- α~100%
- β⁻100%
- α~100%
- β⁻100%