Table 1.
Decay properties of several radionuclides used in diagnostics and therapy.
| Per decay | 67Cu(β) | 67Ga(A) | 99mTc(A) | 111In(A) | 123I∗(A) | 153Sm(β) | 161Tb(β) | 177Lu(β) | 211At(α) |
|---|---|---|---|---|---|---|---|---|---|
| Half- life (days); Decay mode | 2.58; β- | 3.26; ECf | 0.25; ITg β- | 2.80; EC | 0.55; EC | 1.93; β- | 6.89; β- | 6.65; β- | 0.30; EC α |
| Yield of AEa and CKb e- | 0.56 | 4.96 | 4.41 | 7.43 | 13.7 | 6.58 | 11.0 | 1.12 | 6.53 |
| Yield of IEc e- | 0.15 | 0.34 | 1.10 | 0.16 | 0.16 | 0.81 | 1.42 | 0.15 | 3.85E-04 |
| Yield of X-rays | 0.78 | 6.87 | 5.58 | 9.50 | 15.8 | 8.30 | 13.0 | 1.37 | 7.73 |
| Yield of γ rays | 0.73 | 0.87 | 0.89 | 1.85 | 0.86 | 0.37 | 0.53 | 0.18 | 1.38E-02 |
| Yield of β+ or β- | 1.00 | – | 3.70E-05 | – | – | 1.00 | 1.00 | 1.00 | – |
| Yield of α | – | – | – | – | – | – | – | – | 1.00 |
| Yield of α recoils | – | – | – | – | – | – | – | – | 1.00 |
| Total γ- and X-ray energy (keV/nt) | 115 | 160 | 127 | 386 | 173 | 64.3 | 36.5 | 35.1 | 44.8 |
| Total β+ or β- energy (keV/nt) | 136 | – | 4.20E-03 | – | – | 224 | 154 | 133 | – |
| Total IE e- energy (keV/nt) | 13.7 | 29.7 | 15.2 | 27.9 | 21.0 | 40.3 | 39.3 | 13.5 | 0.27 |
| Total AE and CK energy (keV/nt) | 0.75 | 6.64 | 0.94 | 6.88 | 7.23 | 6.02 | 8.94 | 1.13 | 5.86 |
| Total α energy (keV/nt) | – | – | – | – | – | – | – | – | 6.78E+03 |
| Total α recoil energy (keV/nt) | – | – | – | – | – | – | – | – | 131 |
| Total energy released (keV/nt) | 266 | 196 | 1.43 | 441 | 201 | 334 | 239 | 183 | 6.96E+03 |
| (p/e)d ratio | 0.76 | 4.50 | 7.90 | 11.1 | 6.10 | 0.24 | 0.18 | 0.24 | 6.48E-03 |
Yield is the number of radiative species released per decay (/nt). Source: Falzone et al. (2015). Adapted and reproduced with permission from the Journal of Nuclear Medicine. Copyright: Society of Nuclear Medicine and Molecular Imaging.
A: SPECT; B: PET; ∗123I decays to 123Te and 123mTe, with half-lives too long to play a role in TRT. ˆ211At decays to 211Po (T1/2 = 0.516 s) and 207Bi (T1/2 = 31.55 y), radiation from the latter is excluded due to its long half-life.
aAuger electron; bCoster–Kronig electron; cinternal conversion electron; dratio of penetrating to non-penetrating ionizing radiation; especific activity; felectron capture; gisomeric transition.