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Title: Studies on Ca2+-Doped CeBr3 Scintillating Materials

Despite the outstanding scintillation performance characteristics of cerium tribromide (CeBr3) and cerium-activated lanthanum tribromide (LaBr3:Ce), their commercial availability and application is limited due to the difficulties of growing large, crack-free single crystals from these fragile materials. The objective of this investigation was to employ aliovalent doping to increase crystal strength while maintaining the optical properties of the crystal. One divalent dopant (Ca2+) was investigated as a dopant to strengthen CeBr3 without negatively impacting scintillation performance. Ingots containing nominal concentrations of 1.9% of the Ca2+ dopant were grown. Preliminary scintillation measurements are presented for this aliovalently doped scintillator. Ca2+-doped CeBr3 exhibited little or no change in the peak fluorescence emission for 371 nm optical excitation for CeBr3. The structural, electronic, and optical properties of CeBr3 crystals were investigated using the density functional theory within generalized gradient approximation. The calculated lattice parameters are in good agreement with the experimental data. The energy band structures and density of states were obtained. The optical properties of CeBr3, including the dielectric function, were calculated.
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [1]
  1. NSTec
  2. SNL
  3. RMD
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Journal Name: Published in SPIE Proceedings: Penetrating Radiation Systems and Applications XIV; Journal Volume: 8854; Conference: SPIE Conference on Penetrating Radiation Systems and Applications XIV; San Diego, CA; August 25-29, 2013
Research Org:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
HALIDES; PHOSPHORS; RESOLUTION; detector, resolution, scintillator materials, gamma-ray detector, cerium tribromide; CeBr3; high-resolution detector; halides; rare-earth compounds; scintillator; gamma spectral comparison; resolution; aliovalent substitution