Notes
| Isotopes of Neptunium |
| Notes
|
| Neptunium has no stable isotopes. |
 Notable Isotopes  |
|
 235Np [142 neutrons] |
|
 Abundance: synthetic
|
|
| Half life: 396.1 days [ Alpha Decay ]
|
|
| Decay Energy: 5.192 MeV |
|
| Decays to 231Pa.
|
|
| Half life: 396.1 days [ Electron Capture ]
|
|
| Decay Energy: 0.124 MeV |
|
| Decays to 235U.
|
|
| 236Np [143 neutrons] |
|
| Abundance: synthetic
|
|
| Half life: 154 x 103 years [ Electron Capture ]
|
|
| Decay Energy: 0.940 MeV |
|
| Decays to 236U.
|
|
| Half life: 154 x 103 years [ beta- ]
|
|
| Decay Energy: 0.940 MeV |
|
| Decays to 236Pu.
|
|
| Half life: 154 x 103 years [ Alpha Decay ]
|
|
| Decay Energy: 5.020 MeV |
|
| Decays to 232Pa.
|
|
| 237Np [144 neutrons] |
|
| Abundance: synthetic
|
|
| Half life: 2.144 x 106 years
|
|
| Decay Energy: 4.959 MeV |
|
| Decays to 232Pa.
|
|
|