Notes| Isotopes of Protactinium |
| Notes |
| Protactinium has no stable isotopes. |
 Notable Isotopes |
 230Pa [139 neutrons] |
 Abundance: synthetic |
| Half life: 17.4 days
[ Electron Capture ]
|
| Decay Energy: 1.310 MeV |
| Decays to 230Th. |
| Half life: 17.4 days
[ beta- ]
|
| Decay Energy: 0.563 MeV |
| Decays to 230U. |
| 231Pa [140 neutrons] |
| Abundance: synthetic |
| Half life: 32760 years
[ Alpha Decay ]
|
| Decay Energy: 5.149 MeV |
| Decays to 227Ac. |
| 233Pa [142 neutrons] |
| Abundance: synthetic |
| Half life: 26.967 days
[ beta- ]
|
| Decay Energy: 0.571 MeV |
| Decays to 233U. |