Abstract
The Timepix detector can be used for single photon counting or to perform time-over-threshold analyses on single events. By setting an energy threshold, photons can be selected according to their energy. Here, we present the characterization of an assembly of six Timepix chips, bonded to a monolithic 500 μ m thick silicon wafer.Measurements with monochromatic radiation were carried out at the Topo-Tomo beamline at the ANKA synchrotron. With these measurements, an energy calibration was performed and the presampling modulation transfer function (MTFpre) was evaluated for different threshold settings and different photon energies, leading to values from 16.75 to 25.2 mm−1 for a MTFpre of 10 %.The detector was also used for computed tomography in a lab setup with a micro-focus X-ray tube. For these measurements, the detector's thresholds were equalized in order to obtain optimally homogeneous flat field images. With this method, we can increase the dynamic range of the detector without overexposing outlier pixels.
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