Table 1 Decay characteristics of ¹⁷⁷Lu and 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