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. |