Ac
Actinium-228m
Protons (Z)
89
Neutrons (N)
139
Mass number
228
Half-Life
3.0 m
Abundance
---
Mass
228.032 u
Mass Excess
29,430.0 keV
Spin
---
Discovered
2008
Binding energy per nucleon
7,637 keV
Neutron separation energy
4,491 keV
Proton separation energy
5,036 keV
Decay Mode
Decay chain
- AcActinium-228Z 89 · N 1393.0 m
- γ
- β⁻100%
- α~100%
- α~100%
- α100%
- α100%
- β⁻100%
- β⁻64.046%
- α100%