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Figure 3
(Left) The PDF and complimentary CDF (cCDF) of the amount of equivalent charge observed by a single pixel from a single 13.5 keV X-ray photon. The Gaussian hump on the right of the PDF represents collection of the full deposited charge following X-ray absorption, and all probabilities to the left of this hump represent fractional observations of the X-ray deposited charge plume. This distribution has a total of three parameters, with the photon energy standard deviation and photon energy mean describing the position and width of the Gaussian hump, and the size of the point spread affecting the depth of the trough to the left of the Gaussian hump. (Right) The cCDF was directly measured by the PILATUS detector from a 13.5 keV monochromatic source at many comparator threshold voltage levels (Vth in Fig. 1[link]) converted to equivalent units of incident X-ray energy, ranging from 7.5 keV to 21 keV. After averaging all pixel responses at every threshold, the data were fit to the model cCDF with excellent agreement.

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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