Experiences of fifteen years on metrological supervision of radionuclide calibrators used in nuclear medicine.

Pursuant to the Hungarian Law on Legal Metrology, activity measurements in nuclear medicine can be made by verified measuring instruments only. OMH has carried out this legal metrological task of verification for more than 15 years. This paper outlines the calibration results for 12 various radionuclides for more than fifty instruments in our program, experiences of the type approvals of about 10 radionuclide calibrator models and that of the practical usage, the results of the analysis of measurement errors and the human aspects of the measurements. In addition it reports on the bilateral cooperation in the past years between OMH (Hungary) and BEV (Austria) in the field of metrological supervision of radionuclide calibrators.