| Nuc- lide | Atomic Mass | NN | Abun % | Spin | Half Life | DM | DT | BR % | Decay Energy (MeV) |
|---|---|---|---|---|---|---|---|---|---|
| Np225 | 225.0339 | 132 | Syn | 6ms | |||||
| Np226 | 226.0351 | 133 | Syn | 35ms | α | Pa222 | 8.200 | ||
| Np227 | 227.035 | 134 | Syn | 0.51s | α | Pa223 | 7.816 | ||
| Np228 | 228.036 | 135 | Syn | 61.4s | ε | U228 | 60 | 4.480 | |
| 61.4s | α | Pa224 | 40 | 7.420 | |||||
| Np229 | 229.0362 | 136 | Syn | 4m | α | Pa225 | >50 | 7.010 | |
| 4m | ε | U229 | <50 | 2.560 | |||||
| Np230 | 230.0378 | 137 | Syn | 4.6m | ε | U230 | <=97 | 3.610 | |
| 4.6m | α | Pa226 | >=3 | 6.780 | |||||
| Np231 | 231.0382 | 138 | Syn | 5/2 | 48.8m | ε | U231 | 98 | 1.840 |
| 48.8m | α | Pa227 | 2 | 6.370 | |||||
| Np232 | 232.04 | 139 | Syn | 4+ | 14.7m | ε | U232 | 2.700 | |
| Np233 | 233.0407 | 140 | Syn | 5/2+ | 36.2m | α | Pa229 | 5.830 | |
| 36.2m | ε | U233 | 1.230 | ||||||
| Np234 | 234.0429 | 141 | Syn | 0+ | 4.4d | ε | U234 | 1.810 | |
| Np235 | 235.0441 | 142 | Syn | 5/2+ | 396.1d | α | Pa231 | 0.0026 | 5.192 |
| 396.1d | ε | U235 | 0.124 | ||||||
| Np236 | 236.0466 | 143 | Syn | 6- | 154000y | ε | U236 | 87.30 | 0.940 |
| 154000y | β- | Pu236 | 12.50 | 0.940 | |||||
| 154000y | α | Pa232 | 0.16 | 5.020 | |||||
| meta state 0.060MeV | Syn | 1 | 22.5h | ε | U236 | 52 | 1.000 | ||
| 22.5h | β- | Pu236 | 48 | 0.550 | |||||
| Np237 | 237.0482 | 144 | Syn | 5/2+ | 2144000y | SF | <=2E -10 | ||
| 2144000y | α | Pa233 | 4.959 | ||||||
| meta state 2.800MeV | Syn | 45ns | SF | <=100 | |||||
| Np238 | 238.0509 | 145 | Syn | 2+ | 2.117d | β- | Pu238 | 1.292 | |
| Np239 | 239.0529 | 146 | Syn | 5/2+ | 2.3565d | β- | Pu239 | 0.722 | |
| Np240 | 240.0562 | 147 | Syn | 5+ | 61.9m | β- | Pu240 | 2.200 | |
| meta state 0.000MeV | Syn | 1+ | 7.22m | β- | Pu240 | 99.89 | 2.200 | ||
| 7.22m | IT | ||||||||
| Np241 | 241.0582 | 148 | Syn | 5/2+ | 13.9m | β- | Pu241 | 1.310 | |
| Np242 | 242.062 | 149 | Syn | 6 | 5.5m | β- | Pu242 | 2.700 | |
| meta state 0.000MeV | Syn | 1+ | 2.2m | β- | Pu242 | 2.700 | |||
| Np243 | 243.0643 | 150 | Syn | 5/2- | 1.8m | β- | Pu243 | 2.170 | |
| Np244 | 244.068 | 151 | Syn | 7- | 2.29m | ||||
| Nuclide | Potential Parent Nuclides |
|---|---|
| Np225 | None known |
| Np226 | None known |
| Np227 | None known |
| Np228 | Am232 (Syn) |
| Np229 | None known |
| Np230 | Am233 (Syn) |
| Np231 | None known |
| Np232 | Am236 (Syn) Pu232 (Syn) |
| Np233 | Am237 (Syn) Pu233 (Syn) |
| Np234 | Am238 (Syn) Pu234 (Syn) |
| Np235 | Am239 (Syn) Pu235 (Syn) |
| Np236 | Am240 (Syn) |
| meta state 0.060MeV | None known |
| Np237 | Am241 (Syn) Pu237 (Syn) U237 (Syn) |
| meta state 2.800MeV | None known |
| Np238 | Am242m (Syn) Am242m1 (Syn) |
| Np239 | Am243 (Syn) U239 (Syn) |
| Np240 | U240 (Syn) |
| meta state 0.000MeV | None known |
| Np241 | None known |
| Np242 | U242 (Syn) |
| meta state 0.000MeV | None known |
| Np243 | None known |
| Np244 | None known |
Key:
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Kenneth Barbalace. Periodic Table of Elements - Np - Neptunium. EnvironmentalChemistry.com. 1995 - 2024. Accessed on-line: 12/22/2024
https://EnvironmentalChemistry.com/yogi/periodic/Np-pg2.html
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