Pileup rejection in an energy-dispersive radiation...

G - Physics – 01 – T

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G01T 1/36 (2006.01)

Patent

CA 2732522

A method of detecting a pileup in an energy-dispersive radiation spectrometry system, wherein a filter of the system generates a first pulse in response to a preamplifier signal, and wherein the system has one or more fast channels having an energy of full efficiency wherein substantially all photons received having at least the full efficiency energy are detected. The method includes measuring an above threshold time duration of the filter, determining that the fast channels have not made any detections while the first pulse is above the minimum detectable threshold energy of the filter, in response thereto, declaring a pileup if the above threshold time duration exceeds a longest expected pulse duration that is a duration of a second pulse that would be output by the filter in response to a single photon having an energy equal to the energy of full efficiency being received by the system.

Linvention concerne un procédé de détection dun empilement dans un système spectrométrique à dispersion dénergie comportant un filtre générant une première impulsion en réponse à un signal de préamplificateur et un ou plusieurs canaux rapides à rendement énergétique maximal, pratiquement tous les photons reçus présentant au moins le rendement énergétique maximal étant détectés. Le procédé comprend la mesure dune durée seuil supérieur du filtre, le fait de déterminer que les canaux rapides nont rien détecté tandis que la première impulsion est supérieure à lénergie seuil minimale détectable du filtre, en réponse à celle-ci, et lannonce dun empilement si la durée seuil supérieure dépasse la durée dimpulsion attendue la plus longue qui est la durée dune seconde impulsion qui serait sortie par le filtre en réponse à un seul photon possédant une énergie égale à lénergie maximale reçue par le système.

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