Notes
| Isotopes of Promethium |
| Notes
|
| Promethium has no stable isotopes. |
 Notable Isotopes  |
 145Pm [84 neutrons] |
 Abundance: synthetic
|
| Half life: 17.7 years [ Electron Capture ]
|
| Decay Energy: 0.163 MeV |
| Decays to 145Nd.
|
| 146Pm [85 neutrons] |
| Abundance: synthetic
|
| Half life: 5.53 years [ Electron Capture ]
|
| Decay Energy: 1.472 MeV |
| Decays to 146Nd.
|
| Half life: 5.53 years [ beta- ]
|
| Decay Energy: 1.542 MeV |
| Decays to 146Sm.
|
| 147Pm [86 neutrons] |
| Abundance: synthetic
|
| Half life: 2.6234 years [ beta- ]
|
| Decay Energy: 0.224 MeV |
| Decays to 147Sm.
|