19 September 2014 Imaging properties of pixellated scintillators with deep pixels
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Abstract
We have investigated the light-transport properties of scintillator arrays with long, thin pixels (deep pixels) for use in high-energy gamma-ray imaging. We compared 10x10 pixel arrays of YSO:Ce, LYSO:Ce and BGO (1mm x 1mm x 20 mm pixels) made by Proteus, Inc. with similar 10x10 arrays of LSO:Ce and BGO (1mm x 1mm x 15mm pixels) loaned to us by Saint-Gobain. The imaging and spectroscopic behaviors of these scintillator arrays are strongly affected by the choice of a reflector used as an inter-pixel spacer (3M ESR in the case of the Proteus arrays and white, diffuse-reflector for the Saint-Gobain arrays). We have constructed a 3700-pixel LYSO:Ce Prototype NIF Gamma-Ray Imager for use in diagnosing target compression in inertial confinement fusion. This system was tested at the OMEGA Laser and exhibited significant optical, inter-pixel cross-talk that was traced to the use of a single-layer of ESR film as an inter-pixel spacer. We show how the optical cross-talk can be mapped, and discuss correction procedures. We demonstrate a 10x10 YSO:Ce array as part of an iQID (formerly BazookaSPECT) imager and discuss issues related to the internal activity of 176Lu in LSO:Ce and LYSO:Ce detectors.
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H. Bradford Barber, H. Bradford Barber, David Fastje, David Fastje, Daniel Lemieux, Daniel Lemieux, Gary P. Grim, Gary P. Grim, Lars R. Furenlid, Lars R. Furenlid, Brian W. Miller, Brian W. Miller, Philip Parkhurst, Philip Parkhurst, Vivek V. Nagarkar, Vivek V. Nagarkar, "Imaging properties of pixellated scintillators with deep pixels", Proc. SPIE 9215, Radiation Detectors: Systems and Applications XV, 92150F (19 September 2014); doi: 10.1117/12.2066172; https://doi.org/10.1117/12.2066172
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