title: A New Columnar CsI(Tl) Scintillator for iQID detectors.
abstract: A 1650 μm thick columnar CsI(Tl) scintillator for upgrading iQID detectors, which is a high-resolution photon-counting gamma-ray and x-ray detector recently developed at the Center for Gamma-Ray Imaging (CGRI), has been studied in terms of sensitivity, spatial resolution and depth-of-interaction effects. To facilitate these studies, a new frame-parsing algorithm for processing raw event data is also proposed that has more degrees of freedom in data processing and can discriminate against a special kind of noise present in some low-cost intensifiers. The results show that in comparison with a 450 μm-thickness columnar CsI(Tl) scintillator, the 1650 μm thick CsI(Tl) scintillator provides more than twice the sensitivity at the expense of some spatial resolution degradation. The depth-of-interaction study also shows that event size and amplitude vary with scintillator thickness, which can assist in future detector simulations and 3D-interaction-position estimation.
authors.affiliation: College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA.
authors.forename: Ling
authors.initials: L
authors.lastname: Han
authors.affiliation: College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA ; Pacific Northwest National Laboratory, Richland, WA 99352, USA.
authors.forename: Brian W
authors.initials: BW
authors.lastname: Miller
authors.affiliation: College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA ; CGRI, Department of Medical Imaging, University of Arizona, Tucson, AZ 85721, USA.
authors.forename: H Bradford
authors.initials: HB
authors.lastname: Barber
authors.affiliation: Radiation Monitoring Devices, Inc. Watertown, MA 02472, USA.
authors.forename: Vivek V
authors.initials: VV
authors.lastname: Nagarkar
authors.affiliation: College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA ; CGRI, Department of Medical Imaging, University of Arizona, Tucson, AZ 85721, USA.
authors.forename: Lars R
authors.initials: LR
authors.lastname: Furenlid
keywords: Columnar CsI(Tl); depth of interaction; frame parsing; iQID detector; noise discrimination; resolution; sensitivity; thick scintillator