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Proceedings Paper

Linearity response of Ca2+-doped CeBr3 as a function of gamma-ray energy
Author(s): Paul Guss; Michael E. Foster; Bryan M. Wong; F. Patrick Doty; Kanai Shah; Michael R. Squillante; Urmila Shirwadkar; Rastgo Hawrami; Josh Tower; Thomas Stampahar; Sanjoy Mukhopadhyay
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Paper Abstract

An aliovalently calcium-doped cerium tribromide (CeBr3:Ca2+) crystal was prepared with a gamma-energy resolution (FWHM) of 3.2% at the 137Cs 662 keV gamma energy. We completed a crystal assessment and calculated the predictive performance and physical characteristics using density functional theory (DFT) formalism. Detector performance, characteristics, calcium doping concentration, and crystal strength are reported. The structural, electronic, and optical properties of CeBr3 crystals were investigated using the DFT within generalized gradient approximation. Specifically, we see excellent linearity of photons per unit energy with the aliovalent CeBr3:Ca2+ crystal. Proportionality of light yield is one area of performance in which Ce-doped and Ce-based lanthanide halides excel. Maintaining proportionality is the key to producing a strong, high-performance scintillator. Relative light yield proportionality was measured for both doped and undoped samples of CeBr3 to ensure no loss in performance was incurred by doping. The light output and proportionality for doped CeBr3, however, appears to be similar to that of undoped CeBr3. The new crystal was subjected to additional testing and evaluation, including a benchmark spectroscopy assessment. Results, which present energy resolution as a function of energy, are summarized. Typical spectroscopy results using a 137Cs radiation source are shown for our crystallites with diameters <1 cm. We obtain energy resolution of 3.2% before packing the crystallite in a sealed detector container and 4.5% after packing. Spectra were also obtained for 241Am, 60Co, 228Th, and background to illustrate the spectrosocopic quality of CeBr3:Ca2+ over a broader energy range.

Paper Details

Date Published: 26 August 2015
PDF: 10 pages
Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 959304 (26 August 2015); doi: 10.1117/12.2186181
Show Author Affiliations
Paul Guss, National Security Technologies, LLC (United States)
Michael E. Foster, Sandia National Labs. (United States)
Bryan M. Wong, Sandia National Labs. (United States)
F. Patrick Doty, Sandia National Labs. (United States)
Kanai Shah, Radiation Monitoring Devices, Inc. (United States)
Michael R. Squillante, Radiation Monitoring Devices, Inc. (United States)
Urmila Shirwadkar, Radiation Monitoring Devices, Inc. (United States)
Rastgo Hawrami, Radiation Monitoring Devices, Inc. (United States)
Josh Tower, Radiation Monitoring Devices, Inc. (United States)
Thomas Stampahar, National Security Technologies, LLC (United States)
Sanjoy Mukhopadhyay, National Security Technologies, LLC (United States)

Published in SPIE Proceedings Vol. 9593:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII
Larry Franks; Ralph B. James; Michael Fiederle; Arnold Burger, Editor(s)

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