Ac
Actinium-222m
Protons (Z)
89
Neutrons (N)
133
Mass number
222
Half-Life
1.05 m
Abundance
---
Mass
222.018 u
Mass Excess
16,700.0 keV
Spin
(5+)
Discovered
1972
Binding energy per nucleon
7,682 keV
Neutron separation energy
5,901 keV
Proton separation energy
3,553 keV
Decay Mode
Decay chain
- AcActinium-222Z 89 · N 1331.05 m
- α98.6%
- α100%
- α100%
- β⁻~100%
- α100%