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Figure 4
Visual flowchart of the mathematical calibration process that was performed at each X-ray energy. (Top) Images of diffuse X-ray scattering of monochromic 13.5 keV photons from ice at several comparator threshold voltage levels (Vth in Fig. 1[link]), converted to units of electron volts, ranging from 7.5 keV to 21 keV. One representative pixel was chosen from the image stack for displaying in a plot along with their fit to the cCDF model. Noise in the data trace is dominated by 1/f noise from the ∼2 min required to change detector voltage thresholds at all six million pixels. (Bottom) Each of the six million pixels were independently fitted to the cCDF model, with the three parameters of the fit displayed as images. These three pixel-specific calibration parameters define the instrument response of each pixel to X-ray color.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 5| August 2014| Pages 1180-1187
doi:10.1107/S1600577514014167
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