Abstract: A detector for detecting ionising radiation having at least one detector arranged to be connected to a read-out arrangement for the reading-out and the evaluation of a signal from the detector. The detector has a carrier material and a layer having an active detector material applied to the carrier material, which active detector material is arranged, in the event of its receiving incident ionising radiation that is incident upon the layer, to give rise to ionisation in the active detector material in the layer. An electrical field is applied across the layer, whereby the ionisation gives rise to an electric current. The read-out arrangement is arranged to detect such that it can in this way detect the incident ionising radiation. The active detector material in the layer contains ZnO to such an extent that ionising radiation gives rise to a detectable electric current.