Plutonium-244
Plutonium-244 (244Pu) is an isotope of plutonium that has a half-life of 80 million years. This is longer than any of the other isotopes of plutonium and longer than any other actinide isotope except for the three naturally abundant ones: uranium-235 (704 million years), uranium-238 (4.468 billion years), and thorium-232 (14.05 billion years). Given the mathematics of the decay of plutonium-244, an exceedingly small amount should still be present in the Earth's composition, making plutonium a likely although unproven candidate as the shortest lived primordial element.
A concentrated solution of plutonium-244 | |
| General | |
|---|---|
| Symbol | 244Pu |
| Names | plutonium-244, 244Pu, Pu-244 |
| Protons (Z) | 94 |
| Neutrons (N) | 150 |
| Nuclide data | |
| Natural abundance | Trace |
| Half-life (t1/2) | 8×107 years |
| Isotope mass | 244.0642044 Da |
| Spin | 0+ |
| Parent isotopes | 248Cm (α) 244Np (β−) |
| Decay products | 240U |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| α (99.879%) | |
| SF (0.121%) | |
| Isotopes of plutonium Complete table of nuclides | |
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