Abstract：On basis of the "The measurement standard of public service for the medical diagnostic X-ray dosimeters calibration" at National Institute of Metrology of China and according to the requirement in IEC61267—2005 reports, the method for establishing the measurement standard of the new medical diagnostic X-ray dosimeters calibrating conditions is investigated . Two key problems for the calibrating conditions establishment are presented,using invasive measurement of X-ray tube voltage in medical diagnostic radiology to determine the practical peak voltage (PPV) and determination of the RQR series. The first measurement standard of the medical diagnostic X-ray dosimeters calibration is established in China, which meets the requirements of IEC61267—2005 reports. It provides the essential insurance for the accuracy and reliability of quantity values of the nuclear medical diagnostic X-ray equipment within China.
［1］IEC 61674-1997,Medical electrical equipment-dosimeters with ionization chamber and/or semi-conductor as used in X-ray diagnostic imaging［S］.
［2］IEC 61267-2005,Medical diagnostic X-ray equipment-Radiation conditions for use in the determination of characteristics［S］.
［3］IEC 60788-2004,Medical electrical equipment - glossary of defined terms［S］.
［4］Kramer H M, Selbach H J, Iles W J.The practical peak voltage of diagnostic x-ray generators［J］.British Journal of Radiology,1998,71(842):200-209.
［5］IEC 61676-2009,Medical electrical equipment- dosimetric instruments used for non-invasive measurement of X-ray tube voltage in diagnostic radiology［S］.
2011, Vol. 32 
