Radiation detector and method of manufacturing a radiation detector

A radiation detector having a plurality of superimposed individual radiation detectors, each having a relatively thin absorption layer. Thus, compared to a radiation detector with a single absorbent layer of greater thickness, the efficiency and / or detection speed can be increased. It can be either a plurality of individual sub-radiation detectors are stacked parallel one above the other, or two absorption layers are arranged on both sides of a substrate alternatively.