NDLI: Promising Alkaline Earth Halide Scintillators for Gamma-Ray Spectroscopy

Content Provider	IEEE Xplore Digital Library
Author	Shirwadkar, U. Hawrami, R. Glodo, J. van Loef, E.V.D. Shah, K.S.
Copyright Year	1963
Abstract	Up to 1-in-diameter, Eu-doped CsBa₂I₅ and BaBrI crystals have been grown using the vertical Bridgman method. Scintillation properties of the crystals up to ~ 1 × 1 × 1 cm³ have been studied under gamma-ray irradiation. Systematic concentration studies have been performed for both these alkaline earth halides with Eu²⁺ doping levels ranging from 0% to 10% to optimize growth of large crystals. We have achieved excellent energy resolution of ~ 2.6% at 662 keV for a 2 × 2 × 1-mm³ sample of CsBa₂I₅:2%Eu. However, in this paper, the emphasis is on the larger crystals that can be used practically in nuclear nonproliferation applications. Our measurements of a 1.0 × 1.0 × 1.0-cm³ sample of CsBa₂I₅:3%Eu, processed from a 1-in-diameter crystal, shows very good energy resolution of 3.9% at 662 keV, high light output of ~ 80 000 photons/MeV, and a principal decay time of ~ 900 ns. The second investigated composition, BaBrI:5%Eu, 1.0-cm-diameter × 1.0-cm-thick sample shows high light output of 71 000 photons/MeV and energy resolution of 4.3% at 662 keV. A decay time of 480 ns was measured for this sample, which is shorter than most Eu²⁺ doped materials of this size. The emission in these materials is due to d → f transitions of Eu²⁺ and occurs over a single band between 400-500 nm. It peaks at ~ 430 nm for CsBa₂I₅:Eu and at ~ 413 nm for BaBrI:Eu. Since both compositions show high proportionality over a wide range of energies, we expect to see improvements in the energy resolution of large crystals, as better quality of 1-in-diameter crystals are grown.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	1011
Ending Page	1015
Page Count	5
File Size	1118160
File Format	PDF
ISSN	00189499
Volume Number	60
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Crystals Energy resolution Doping Spectroscopy Photonics Earth scintillation properties Alkaline earth halides BaBrI CsBa$_{2}{\hbox{I}}_{5}$ gamma-ray spectroscopy nuclear nonproliferation
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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