Actinium series
| Uranium-235 (α, 7.04 × 108 a) | |||
| Thorium-231 (β−, 25.52 h) | |||
| Protactinium-231 (α, 3.276 × 104 a) | |||
| Actinium-227 (21.772 a) | |||
| β−, 98.62% | α, 1.38% | ||
| Thorium-227 (α, 18.68 d) |
Francium-223 (22.00 min) | ||
| β−, 99.994% | α, 0.006% | ||
| Radium-223 (α, 11.43 d) |
Astatine-219 (56 s) | ||
| β−, 3.00% | α, 97.00% | ||
| Radon-219 (α, 3.96 s) |
Bismuth-215 (β−, 7.6 min) | ||
| Polonium-215 (1.781 ms) | |||
| α, 99.99977% | β−, 0.00033% | ||
| Lead-211 (β−, 36.1 min) |
Astatine-215 (α, 0.1 ms) | ||
| Bismuth-211 (2.14 min) | |||
| α, 99.724% | β−, 0.276% | ||
| Thallium-207 (β−, 4.77 min) |
Polonium-211 (α, 516 ms) | ||
| Lead-207 (STABLE) | |||
The actinium series is a decay chain starting from naturally-occuring uranium-235 and ending in stable lead-207. It is named after the first of its members to be discovered, 235U not being discovered until 1935.
References
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