TABLE 1.
224Ra Decay Chain Photon Emissions (Cutoff, 40 keV and 0.5%)
| Nuclide | Energy | P (%) | Ray type |
|---|---|---|---|
| 208Tl, α | 73.0 | 0.8 | x |
| 212Pb | 75.1 | 10.6 | x |
| 208Tl, α | 75.3 | 1.4 | x |
| 212Pb | 77.4 | 17.7 | x |
| 212Pb | 87.1 | 2.0 | x |
| 212Pb | 87.7 | 3.8 | x |
| 212Pb | 90.2 | 0.9 | x |
| 212Pb | 115 | 0.6 | γ |
| 212Pb | 239 | 43.3 | γ |
| 224Ra | 241 | 4.1 | γ |
| 208Tl, α | 277 | 2.3 | γ |
| 212Pb | 300 | 3.3 | γ |
| 208Tl, α | 511 | 8.1 | γ |
| 208Tl, α | 583 | 30.3 | γ |
| 212Bi, β | 727 | 4.2 | γ |
| 208Tl, α | 763 | 0.7 | γ |
| 212Bi, β | 785 | 0.7 | γ |
| 208Tl, α | 861 | 4.5 | γ |
| 212Bi, β | 1621 | 1.0 | γ |
| 208Tl, α | 2615 | 35.6 | γ |
P = probability of emission per 224Ra decay obtained from International Commission on Radiological Protection publication 107 (8); β = β-decay branch of 212Bi, 64%; α = α-decay branch of 212Bi, 36%.
Value of highest-frequency photon emission, in bold, within each window was used for AC.