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Proceedings Paper

Scintillation properties of a Cs2LiLa(Br6)90%(Cl6)10%:Ce3+ (CLLBC) crystal
Author(s): Paul P. Guss; Thomas G. Stampahar; Sanjoy Mukhopadhyay; Alexander Barzilov; Amber Guckes
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Paper Abstract

In investigations of Ce3+-doped Cs2LiLa(Br6)90%(Cl6)10% (CLLBC) elpasolite crystals, the crystals show an excellent neutron and gamma (n/γ) radiation response. The results of our studies on the scintillation properties of CLLBC viz. radioluminescence, energy resolution, light yield, decay times, and nonproportionality are discussed. The CLLBC detector can provide energy resolution as good as 4.1% at 662 keV (FWHM), which is better than that of NaI:Tl. Because the crystal contains 6Li, CLLBC can also detect thermal neutrons. In the energy spectra, the full energy thermal neutron peak appears near or above 3 MeV gamma equivalent energy. This high-energy signature for the thermal neutron peak means that very effective pulse height discrimination is possible. Unfortunately, because the core-to-valence luminescence observed in other elpasolites that can be exploited for effective pulse shape discrimination (PSD) is not observed in the CLLBC, other strategies for obtaining the PSD of CLLBC are needed. The n/γ discrimination capability of CLLBC detectors may be optimized by tuning the cerium doping content for maximum effect on n/γ pulse shape differences. The value of adding a chlorine component to the nominal CLLB crystal is discussed. Because the crystal contains chlorine, its sensitivity to fast neutrons is better than that of Cs2LiLaBr6 (CLLB). Further, an array of three of these CLLBC detectors may be able to perform directional detection in both the neutron and gamma channels simultaneously.

Paper Details

Date Published: 4 September 2014
PDF: 15 pages
Proc. SPIE 9215, Radiation Detectors: Systems and Applications XV, 921505 (4 September 2014); doi: 10.1117/12.2060204
Show Author Affiliations
Paul P. Guss, National Security Technologies, LLC (United States)
Thomas G. Stampahar, National Security Technologies, LLC (United States)
Sanjoy Mukhopadhyay, National Security Technologies, LLC (United States)
Alexander Barzilov, Univ. of Nevada, Las Vegas (United States)
Amber Guckes, Univ. of Nevada, Las Vegas (United States)

Published in SPIE Proceedings Vol. 9215:
Radiation Detectors: Systems and Applications XV
Gary P. Grim; H. Bradford Barber, Editor(s)

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