An X-ray detector (10) comprising: a photocathode (20) for receiving X-ray radiation and being operative to provide in response thereto an output of electrons; and integrally formed therewith at least one gaseous electron multiplier having a gas and operative in response to the output of electrons from the photocathode to provide an avalanche comprising an increased number of electrons, and wherein said at least one electron multiplier includes a preamplification stage (22) and said photocathode constitutes a cathode of said preamplification stage.
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