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The effective bandwidth of an energy dispersive x-ray fluorescencespectroscopy system is limited by the timing of incident photons. When multiplephotons strike the detector within the processing time of the detector photonpile-up occurs and the signal received by the detector during this intervalmust be ignored. In conventional ED-XRF systems the probability of a photonbeing incident upon the detector is uniform over time, and thus pile-up followsPoisson statistics. In this paper we present a mathematical treatment of therelationship between photon timing statistics and the count rate of an XRFsystem. We show that it is possible to increase the maximum count rates byapplying feedback from the detector to the x-ray source to alter the timingstatistics of photon emission. Monte-Carlo simulations, show that thistechnique can increase the maximum count rate of an XRF spectroscopy system bya factor of 2.94 under certain circumstances.

Use of Feedback to Maximize Photon Count Rate in XRF Spectroscopy