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Linearity Response of Ca2+- Doped CeBr3 as a Function of Gamma-Ray Energy

Conference · · Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 959304 (26 August 2015); doi: 10.1117/12.2186181
DOI:https://doi.org/10.1117/12.2186181· OSTI ID:1241911
 [1];  [2];  [2];  [2];  [3];  [3];  [3];  [3];  [4];  [1];  [5]
  1. Remote Sensing Lab. (RSL), Nellis AFB, Las Vegas, NV (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Radiation Monitoring Devices, Inc.
  4. Radiiation Monitoring Devices, Inc.
  5. Remote Sensing Lab. (RSL), Andrews AFB, Maryland (United States)
+ Show Author Affiliations
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.
Research Organization:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
AC52-06NA25946
OSTI ID:
1241911
Report Number(s):
DOE/NV/25946--2432
Conference Information:
Journal Name: Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 959304 (26 August 2015); doi: 10.1117/12.2186181 Journal Volume: 9593
Country of Publication:
United States
Language:
English

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Related Subjects

CeBr3
aliovalent substitution
detector
resolution
scintillator materials
gamma ray detector
cerium tribromide
gamma spectral comparison
halides
high-resolution detector
rare-earth compounds
resolution
scintillator