Abstract: The invention relates to a multi-layered radiation converter, a radiation detector comprising such a converter as well as a radiation-based imaging system using such a detector. Each converter layer (32) in the radiation converter is adapted for interaction with incident radiation to cause the emission of electrons into drift holes defined in the converter layer. The drift holes of one converter layer (32-1) are staggered with respect to the drift holes of another converter layer (32-2). By mutually shifting the converter layers such that the drift holes of two different layers are no longer well-aligned, but rather staggered with respect to each other, the effective conversion area will be increased, and the probability of incoming radiation passing through the stack without interaction with the converter layers will be significantly reduced.

Abstract: A radiation sensor device (20) for detection of radiation. A sensor device with an array of radiation sensitive elements (24) forming a sensor surface (26) is provided. The device comprises a number of circuit boards (21), each with a row of radiation sensitive elements, such as X-ray sensitive charge collectors, provided at the edge portion. The radiation sensitive elements are each connected to signal processing means (28), e.g. ASICs with amplifiers, outside the radiation field by a respective connection line (25) arranged on a main surface (22) of the circuit board. A number of circuit boards are arranged adjacent to each other with the main planes substantially perpendicular to the sensor surface. By using the circuit card depth the invention easily provides surfaces with a very large number of individually connected radiation sensitive elements, resulting in improved image resolution.