Thorium series
The thorium series is the natural decay series of the thorium isotope 232 Th. Its end nuclide is the lead isotope 208 Pb. Because the starting nuclide of the series is the plutonium isotope 244 Pu, which occurs in very small quantities in nature , the series begins there. However, it is named after the most common nuclide 232 Th.
Natural radioactive decay series: Thorium series (blue) |
4 n row
nuclide | Decay | Half-life | E / MeV | Decay product |
---|---|---|---|---|
244 Pu |
α 99.879% SF 0.121% |
80 · 10 6 a | 4.666 ? |
240 U ? |
240 U | β - | 14.1 h | 0.4 | 240 Np |
240 Np | β - | 65 min | 0.9 | 240 pu |
240 pu | α | 6564 a | 5.256 | 236 U |
236 U | α | 2.3 · 10 7 a | 4.494 | 232 Th |
232 Th | α, γ | 1.405 x 10 10 a | 4.083 | 228 ra |
228 ra | β - | 5.75 a | 0.046 | 228 Ac |
228 Ac | β - | 6.15 h | 2.127 | 228 Th |
228 Th | α | 1.9131 a | 5.520 | 224 ra |
224 ra | α | 3.66 d | 5.789 | 220 para |
220 para | α | 55.6 s | 6.405 | 216 Po |
216 Po | α | 0.145 s | 6,906 | 212 Pb |
212 Pb | β - | 10.64 h | 0.574 | 212 bi |
212 bi | β - 64.06% α 35.94% |
60.55 min | 2.254 6.207 |
212 Po 208 Tl |
212 Po | α | 2.99 · 10 −7 s | 8,954 | 208 Pb |
208 Tl | β - | 3.083 min | 5.001 | 208 Pb |
208 Pb | . | Stable | . | . |