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In order to assess the performance of liquid xenon detectors for use inpositron emission tomography we studied the scintillation light and ionizationcharge produced by 511 keV photons in a small prototype detector. Scintillationlight was detected with large area avalanche photodiodes while ionizationelectrons were collected on an anode instrumented with low noise electronicsafter drifting up to 3 cm. Operational conditions were studied as a function ofthe electric field. Energy resolutions of <10 % (FWHM) were achieved bycombining the scintillation light and ionization charge signals. Therelationship between scintillation light and ionization signals wasinvestigated. An analysis of the sources of fluctuations was performed in orderto optimize future detector designs.

Simultaneous reconstruction of scintillation light and ionization charge produced by 511 keV photons in liquid xenon : potential application to PET