Figure 2
(a) Threshold scans for monochromatic photons (average of all the pixels), recorded at different photon energies. (b) Derivative of the threshold scans for the average of all pixels. The energy of the peaks corresponds to the Kα energy of the fluorescence target used. From left to right: Cr, Fe, Cu, Ge and Mo. (c) Threshold-to-energy calibration for the different gain settings. (d) Derivative of a threshold scan for Cu photons, with `trimmed' and `untrimmed' settings (average for all pixels). |