Notes
| Isotopes of Protactinium |
| Notes
|
| Protactinium has no stable isotopes. Its longest-lived isotope has a half-llife of 32,760 years. |
 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.
|