Structure and scintillation of Eu2+-activated calcium bromide iodide

Journal Article · Sun Mar 01 00:00:00 EST 2015 · Journal of Luminescence

DOI:https://doi.org/10.1016/j.jlumin.2014.11.031· OSTI ID:1512108

Gundiah, Gautam; Gascón, Martin; Bizarri, Gregory; Derenzo, Stephen E; Bourret-Courchesne, Edith D

© 2015, Elsevier. All rights reserved. We report the structure and scintillation properties of Eu2+-activated calcium bromide iodide. CaBr0.7I1.3was the only composition that could be synthesized in the CaBr2-CaI2 system. The compound has an effective atomic number of 47 and crystallizes in a trigonal crystal system with the R-3 space group and a density of 3.93 g/cc. The structure is layered and contains Ca in an octahedral environment with the Br/I anions jointly occupying a single site. Eu2+-activated samples show an intense narrow emission, characteristic of the 5d-4f transition of Eu2+, when excited with UV or X-rays. The sample with 0.5% Eu shows a light output of 63,000 ph/MeV at 662 keV with 96% of the light emitted with a monoexponential decay time of 1332 ns. An energy resolution of 10.4% full width at half maximum (FWHM) has been achieved for 662 keV gamma rays at room temperature.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1512108
• Journal Information: Journal of Luminescence, Vol. 159, Issue C; ISSN 0022-2313
• Country of Publication: United States
• Language: English