Activity standardization and half-life measurement of 177Lu

The activity of the 177Lu solution has been measured by means of the CIEMAT/NIST efficiency tracing method. This result has been compared to the previous obtained results received from 4 pi beta(LS)-gamma coincidence and anti-coincidence counting. The activities determined with various methods have been found to be consistent. The decay curve of the 177Lu solution has been followed in the TDCR counter to determine the half-life of this isotope. The half-life has been separately determined for double and triple coincidence events. The arithmetic mean value of these two results has been found to be T1/2 = 6.6489(52) d.

Automated summary

The activity of 177Lu solution was measured using the CIEMAT/NIST efficiency tracing method and compared to results obtained from beta-gamma coincidence and anti-coincidence counting. The activities determined using different methods were found to be consistent. The decay curve of the 177Lu solution was tracked in the TDCR counter to determine its half-life. The half-life was separately determined for double and triple coincidence events, and the arithmetic mean value of these two results was found to be T1/2 = 6.6489(52) d.