Notes
| Isotopes of Actinium |
| Notes
|
| No stable isotopes of Actinium exist. |
 Notable Isotopes  |
|
 225Ac [136 neutrons] |
|
 Abundance: Synthetic
|
|
| Half life: 10 days [ Alpha Decay ]
|
|
| Decay Energy: 5.935 MeV |
|
| Decays to 221Fr.
|
|
|
|
| 226Ac [137 neutrons] |
|
| Abundance: Synthetic
|
|
| Half life: 29.32 hours [ beta- ]
|
|
| Decay Energy: 1.117 MeV |
|
| Decays to 226Th.
|
|
| Half life: 29.32 hours [ Electron Capture ]
|
|
| Decay Energy: 0.640 MeV |
|
| Decays to 226Ra.
|
|
| Half life: 29.32 hours [ Alpha Decay ]
|
|
| Decay Energy: 5.536 MeV |
|
| Decays to 222Fr.
|
|
| 227Ac [138 neutrons] |
|
| Abundance: 100%
|
|
| Half life: 21.773 years [ beta- ]
|
|
| Decay Energy: 0.0.45 MeV |
|
| Decays to 227Th.
|
|
| Half life: 21.773 years [ Alpha Decay ]
|
|
| Decay Energy: 5.042 MeV |
|
| Decays to 223Fr.
|