1. A computer tomograph, comprising: a radiation source for emission of X-ray radiation with a predetermined intensity and a predetermined spectrum; a detector unit, including a plurality of detectors, for verification of X-ray radiation, wherein individual detectors of the detector unit are designed to receive incident X-ray quanta in the X-ray radiation and to detect the number of X-ray quanta in the received X-ray radiation whose quantum energy exceeds a predetermined threshold value; a transmission device for transmission of the information detected by the detectors in the detector unit to an evaluation device; and an evaluation device, designed to calculate a measurement result from a measurement object through which the X-ray radiation has passed on the basis of the information detected by the detectors in the detector unit, wherein the individual detectors in the detector unit are designed to detect both the intensity and the quantum energy of the individual X-ray quanta in the received X-ray radiation, and, for each measurement period, to emit a spectrum which, in addition to information about the number of X-ray quanta of medium quantum energy received in each measurement period, and hence the intensity, also contains information about the respective quantum energy in the X-ray quanta, and thus the spectrum of the received X-ray radiation; and wherein the evaluation device is also designed to calculate the measurement result from the measurement object on the basis of the information detected by the detectors relating to the intensity and quantum energy of the individual X-ray quanta in the received X-ray radiation, taking into account the intensity and the spectrum of the X-ray radiation emitted from the radiation source.