Standardization of 67Ga by 4pigamma (NaI) and 4pibeta-gamma coincidence methods.
The nuclide 67Ga is widely used in nuclear medicine for diagnostic purposes. It decays with a half-life of 3.259 days to 67Zn, a stable nuclide. The decay mode is electron capture with several branches followed by gamma-de-excitation. One of the excited levels of 67Zn with energy 93 keV has a half-life of 9.1 micros, 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.
Metrología de Radiaciones Ionizantes, CIEMAT, Edificio 12, Avenida Complutense 22, Madrid 28040, Spain. e.garciatorano@ciemat.es
Eduardo
E
García-Toraño
Miguel
M
Roteta
D000465:Algorithms; D001610:Beta Particles; D002951:Citrates / Q000032:analysis* / Q000592:standards*; D005708:Gallium / Q000032:analysis* / Q000592:standards*; D005720:Gamma Rays; D015233:Models, Statistical; D011786:Quality Control; D019275:Radiopharmaceuticals / Q000032:analysis* / Q000592:standards*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012974:Sodium Iodide / Q000528:radiation effects; D013051:Spectrometry, Gamma / Q000379:methods* / Q000592:standards*; D014159:Transducers
D002951:Citrates; D019275:Radiopharmaceuticals; D005708:Gallium; D012974:Sodium Iodide; C103850:gallium citrate