Table 1 Comparison of the properties of ¹⁷⁷Lu and ¹⁶⁹Er radioisotopes and their precursor stable isotopes.

Half-life (days)

6.6443(9)

9.392(18)

Thermal neutron capture cross-section of the precursor isotope (barns)

2057 b (¹⁷⁶Lu)

2.74 b (¹⁶⁸Er)

2.85 b (¹⁷⁶Yb)

Natural abundance of the precursor isotope (%)

2.599% (¹⁷⁶Lu)

26.978% (¹⁶⁸Er)

12.995% (¹⁷⁶Yb)

Mean / maximum energies of β^- radiation (keV) and intensity

148.8 / 496.8 (79.44%)

98.3 / 342.9 (45%)

111.2 / 383.8 (8.89%)

47.23 / 175.5 (11.66%)

101.0 / 351.3 (55%)

γ-ray energy and intensity

112.9 (6.23%)

208.4 (10.41%)

109.8 (1.3 × 10^–3%)

118.2 (1.4 × 10^–4%)