Table I.
Table I: decay schemes and energies for α-emitters used in RPT. These tables correspond to the decay schemes illustrated in figure 1. Table Ia is for the 211At decay chain, table Ib for 212Pb, table Ic for 225Ac and table Id for 227Th.
| Table | isotope | decay | energy (MeV) |
branching ratio |
half-life | descendant |
|---|---|---|---|---|---|---|
| Ia | 211At | alpha | 5.98 | 0.418 | 7.21 h | 207Po |
| 211At | EC | - | 0.582 | 7.21 h | 211Po | |
| 211Po | alpha | 7.59 | 1.000 | 0.516 s | 207Pb | |
| Ib | 212Pb | beta | 0.102 | 1.000 | 10.6 h | 212Bi |
| 212Bi | alpha | 6.21 | 0.359 | 60.6 min | 208Tl | |
| 212Bi | beta | 0.774 | 0.641 | 60.6 min | 212Po | |
| 212Po | alpha | 8.95 | 1.000 | 0.3 us | 208Pb | |
| 208Tl | beta | 0.558 | 1.000 | 3.05 min | 208Pb | |
| Ic | 225Ac | alpha | 5.95 | 1.000 | 10.0 d | 221Fr |
| 221Fr | alpha | 6.46 | 1.000 | 4.9 min | 217At | |
| 217At | alpha | 7.2 | 1.000 | 32.3 ms | 213Bi | |
| 213Bi | alpha | 5.98 | 0.021 | 45.6 min | 209Tl | |
| 213Bi | Beta | 0.428 | 0.979 | 45.6 min | 213Po | |
| 213Po | Alpha | 8.54 | 1.000 | 4.2 us | 209Pb | |
| 209Tl | Beta | 0.659 | 1.000 | 2.2 min | 209Pb | |
| 209Pb | Beta | 0.193 | 1.000 | 3.25 h | 209Bi | |
| Id | 227Th | Alpha | 6.15 | 1.000 | 18.7 d | 223Ra |
| 223Ra | Alpha | 5.98 | 1.000 | 11.4 d | 219Rn | |
| 219Rn | Alpha | 6.95 | 1.000 | 3.96 s | 215Po | |
| 215Po | Alpha | 7.53 | 1.000 | 1.78 ms | 211Pb | |
| 211Pb | Beta | 0.449 | 1.000 | 36.1 min | 211Bi | |
| 211Bi | Alpha | 6.75 | 0.997 | 2.14 min | 211Po | |
| 211Bi | Beta | - | 0.003 | 2.14 min | 207Tl | |
| 211Po | Alpha | 7.59 | 1.000 | 0.516 s | 207Pb | |
| 207Tl | Beta | 0.495 | 1.000 | 4.77 min | 207Pb | |