Ra
Radium-228
Protons (Z)
88
Neutrons (N)
140
Mass number
228
Half-Life
5.75 y
Abundance
---
Mass
228.031 u
Mass Excess
28,940.2 keV
Spin
0+
Discovered
1907
Binding energy per nucleon
7,642 keV
Neutron separation energy
6,309 keV
Proton separation energy
8,031 keV
Decay Mode
- β⁻→Actinium-228100%
Decay chain
- RaRadium-228Z 88 · N 1405.75 y
- β⁻100%
- β⁻100%
- α~100%
- α~100%
- α100%
- α100%
- β⁻100%
- β⁻64.046%
- α100%