Standardization of (67)Ga by 4pigamma (NaI) and 4pibeta-gamma coincidence methods.

摘要

The nuclide (67)Ga is widely used in nuclear medicine for diagnostic purposes. It decays with a half-life of 3.259days to (67)Zn, a stable nuclide. The decay mode is electron capture with several branches followed by [Formula: see text] - de-excitation. One of the excited levels of (67)Zn with energy 93keV has a half-life of 9.1micros, which makes its absolute standardization by coincidence methods difficult. Two methods were used to standardize a solution of this nuclide: (a) 4pi-EC(PPC)-gamma(NaI) coincidence counting with efficiency extrapolation to infinite dead time and (b) high-efficiency 4pigamma counting with a well-type NaI detector.