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Figure 8
The changes in diffraction efficiency (including detector quantum efficiency), normalized to the value at 12.4 keV, as a function of beam energy for different cubic crystals of different sizes (specified lengths are of one crystal dimension). DE is calculated using Monte Carlo simulations including the probability of photoelectron escape from the crystal and also photoelectron entry from the surrounding material. All heavy atoms (Z > 8) have been removed from the crystal and the surroundings to prevent absorption edges obscuring the results. For all crystal sizes the beam is matched to the size of the crystal. The `best detector' calculation (d) uses the DE for the detector which has the best quantum efficiency for that Einc. This is 450 µm silicon for Einc ≤ 9.3 keV, 1000 µm for 9.3 keV < Einc ≤ 20 keV, and 750 µm CdTe for Einc > 20 keV.

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