Primary standardization of 67Ga radiopharmaceuticals

The two-dimensional extrapolation technique and dead time extrapolation technique of 4πβ-γ-coincidence counting were used to standardize the activity of 67Ga. The counting results of the two absolute counting techniques showed good agreement while the two-dimensional extrapolation technique could save about 50% of the total counting time in this study. The accuracy of the Capintec CRC-15R radionuclide calibrator used by the radiopharmacy of INER was studied in this research. A new calibration setting number, 99, was recommended to the radiopharmacy of INER in the Bayer 10 mL sterile empty vial geometry.