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Sensitivities measured on the three gamma cameras with both collimators, for the three isotopes: 223Ra (top), 225Ac (middle), 227Th (bottom). The energy windows I, II and III are: 85 keV ± 20%, 154 keV ± 20%, and 270 keV ± 10% for 223Ra; 82 keV ± 20%, 216.8 keV ± 8%, and 444.3 keV ± 5% for 225Ac; 50.6 keV ± 20%, 85.7 keV ± 15%, and 240 keV ± 9% for 227Th.
