. 2020 May 19;7:33. doi: 10.1186/s40658-020-00301-2

Table 1.

Decay characteristics of ¹⁷⁷Lu and ¹⁶¹Tb

Radionuclide	¹⁷⁷Lu	¹⁶¹Tb
Half-life (day)	6.647	6.906
Type of decay (%)	β⁻ (100%)	β⁻ (100%)
β particles mean energy (keV)	133.3	154.3
Daughter	¹⁷⁷Hf (stable)	¹⁶¹Dy (stable)
CE (keV per decay)	13.52	39.28
CE energy range in keV (weighted average energy)^a	6.2 – 206.3 (87)	3.3 – 98.3 (28)
AE (keV per decay)	1.13	8.94
AE energy range in keV (weighted average energy)^a	0.01 – 61.7 (1)	0.018 – 50.9 (0.8)
Total electron energy per decay (keV)	147.9	202.5
γ for imaging: energy in keV (% abundance)	208 (11%); 113 (6.4%)	75 (10.2%)
Photons X and γ (total energy per decay in keV)	35.1	36.35

^aThe weighted average energy was computed as $(\sum_{i = 1}^{n} E_{i} * w_{i}) / \sum_{i = 1}^{n} w_{i}$ , where w_i is the emission probability by nuclear transformation of an electron with energy E_i