Abstract
The signal‐to‐noise performance of SXAPS instruments is analyzed. It is found that energy detectors are intrinsically superior to quantum detectors in SXAPS. The use of an aluminum filter with a quantum detector improves its signal‐to‐noise in the energy range just below the aluminum K absorption edge but does not bring its performance up to the level of an unfiltered energy detector. The use of x‐ray filtration with an energy detector does not improve its performance at any energy and seriously degrades performance in regions of low filter transmission. Both types of detector have a greater sensitivity to the bremsstrahlung background than to the appearance potential structure of interest.
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