PDC - Patient Dose Calibrator is a precise measuring instrument for fast and easy determination of the dose area product (DAP) for verification / calibration of tha DAP showing of diagnostic X-ray systems. Manual measurement of the area is not necessary, because the whole x-ray radiation field is detected by the PDC. Inhomogeneity of intensity of the radiation field does not distort the measurement result, in comparison to conventional methods of determination of DAP with dosimeters and manual surface measurement. A dose determination is possible, too. The PDC is calibrated in accordance to national and international standards.