| Series | Starting Isotopes | Half-life/years | Stable End Product |
| Uranium-235 | 235U92 | 7.04 × 108 | 207Pb82 |
| Uranium-238 | 238U92 | 4.478 × 109 | 206Pb82 |
| Thorium-232 | 232Th90 | 1.41 × 1010 | 208Pb82 |