title: Imaging properties of pixellated scintillators with deep pixels.
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 10×10 pixel arrays of YSO:Ce, LYSO:Ce and BGO (1mm × 1mm × 20 mm pixels) made by Proteus, Inc. with similar 10×10 arrays of LSO:Ce and BGO (1mm × 1mm × 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 10×10 YSO:Ce array as part of an iQID (formerly BazookaSPECT) imager and discuss issues related to the internal activity of176Lu in LSO:Ce and LYSO:Ce detectors.
authors.affiliation: Center for Gamma-Ray Imaging, University of Arizona, Tucson, AZ.
authors.forename: H Bradford
authors.initials: HB
authors.lastname: Barber
authors.affiliation: Center for Gamma-Ray Imaging, University of Arizona, Tucson, AZ.
authors.forename: David
authors.initials: D
authors.lastname: Fastje
authors.affiliation: Center for Gamma-Ray Imaging, University of Arizona, Tucson, AZ ; Los Alamos National Laboratories, Los Alamos, NM.
authors.forename: Daniel
authors.initials: D
authors.lastname: Lemieux
authors.affiliation: Los Alamos National Laboratories, Los Alamos, NM.
authors.forename: Gary P
authors.initials: GP
authors.lastname: Grim
authors.affiliation: Center for Gamma-Ray Imaging, University of Arizona, Tucson, AZ.
authors.forename: Lars R
authors.initials: LR
authors.lastname: Furenlid
authors.affiliation: Pacific Northwest National Laboratories, Richland, WA.
authors.forename: Brian W
authors.initials: BW
authors.lastname: Miller
authors.affiliation: Proteus, Inc., Chagrin Falls, OH.
authors.forename: Philip
authors.initials: P
authors.lastname: Parkhurst
authors.affiliation: Radiation Monitoring Devices, Inc. Watertown, MA, USA.
authors.forename: Vivek V
authors.initials: VV
authors.lastname: Nagarkar
keywords: LSO; LYSO; high-energy gamma-ray imaging; internal radioactivity; pixellated scintillators; scintillators