Disclosed is a semiconductor radiation detector for detecting X-ray and/or gamma-ray radiation. The radiation detector comprises: a converter element for converting incident X-ray and gamma-ray photons into electron-hole pairs; a plurality of first cathode electrodes extending along a first axis and being arranged on a first side of the converter element with a pitch (P) along a second axis perpendicular to the first axis; at least one anode electrode arranged on a second side of the converter element; a readout circuitry; and a processing unit connected to the readout circuitry. The Processing unit being configured to determine for each of the plurality of first cathode electrodes the electrical potential at a first and second point in time (t1) (t2) resulting in a plurality of determined potentials; and estimate the location of the event in the converter element along the second axis by processing the plurality of determined potentials.