Detector unit with pulse shaper

A detector unit for the detection of photons of incident radiation, comprising:

• a conversion unit in which incident photons are converted into charge signals, wherein said charge signals are amplified by a charge sensitive amplifier,
• a signal processing circuit for generating signals that are dependent on the energy of a currently detected photon and at least one processing-parameter;
• a flux estimator for estimating the flux of photons and for adjusting the processing-parameter based on said estimated flux, wherein the flux estimator receives its input signals from a processing stage that is independent of the output of the signal processing circuit,
• wherein the signal processing circuit comprises a shaper for generating an electrical pulse with a shape determined by the energy of a currently detected photon and the processing parameter, said shaper comprising an amplifier with a feedback path including a resistor and/or a capacitor,
• and wherein the flux estimator comprises an integrator which receives as its input the output of the charge sensitive amplifier and wherein the output of the integrator adjusts the resistor and/or the capacitor of the shaper.