Standardisation and decay data of 177Lu and 188Re

The activity values of 177Lu and 188Re standard sources were measured using the 4πβ–γ-coincidence method and by liquid scintillation counting. The X- and gamma-ray emission probabilities per disintegration were determined by means of photon spectrometry with calibrated Ge and Si(Li) detectors and using the pertinent activity values. The half-lives were measured with ionization chambers, yielding T1/2(177Lu)=6.646(5) d and T1/2(188Re)=0.70848(9) d.