NDLI: Large-area Crystalline Microcolumnar LaBr:Ce for high-resolution gamma ray imaging

Content Provider	IEEE Xplore Digital Library
Author	Bhandari, H.B. Gelfandbein, V. Miller, S.R. Agarwal, A. Miller, B. Barber, H.B. Nagarkar, V.V.
Copyright Year	2011
Description	Author affiliation: University of Arizona, Tucson, 85724, USA (Miller, B.; Barber, H.B.) \|\| Radiation Monitoring Devices, Inc. (RMD), Watertown, MA 02472, USA (Bhandari, H.B.; Gelfandbein, V.; Miller, S.R.; Agarwal, A.; Nagarkar, V.V.)
Abstract	Exploration of a novel and highly time- and cost-efficient approach to produce important lanthanide halide scintillators is being carried out, at RMD. These materials include LaBr:Ce, LaBr:Pr and LaCl:Ce, in large physical sizes and production volumes, in both existing formats and new light-conserving morphologies required for demanding spectroscopic and imaging applications. Synthesis of such structures is accomplished using hot wall evaporation technique, which not only provides us with the control over film stoichiometry required to achieve efficient scintillation, but also permits the control of film morphology to tailor light propagation within the structure. This technique permits fabrication of thick films that can simultaneously provide the high absorption efficiency and high spatial resolution required for small-animal SPECT imaging and other medical and non-medical applications. Here we report on the growth of LaBr:Ce scintillator films in our Crystalline Microcolumnar Structure™ (CMS™) form, which preserves response uniformity over the (often large) area of the film, and transparency throughout its thickness. Specifically, we have repeatedly produced LaBr:Ce films measuring 6 cm in diameter (limited only by the size of the vapor deposition system used in this development) and approaching 2 cm in thickness, with densely packed microcolumns averaging ∼25 µm in diameter. These films show bright light emissions comparable to their crystalline counterparts, and energy resolution of ∼9% at 122 keV $(^{57}Co$ emission). Imaging data acquired using the University of Arizona Bazooka SPECT detector incorporating our CMS LaBr:Ce film demonstrated ∼125 µm spatial resolution at 122 keV, which is consistent with the measured intrinsic spatial resolution of 3 line-pair(LP)/mm of the film used, as determined at RMD using X-ray techniques.
Starting Page	12
Ending Page	17
File Size	1311952
Page Count	6
File Format	PDF
ISBN	9781467301183
ISSN	10823654
e-ISBN	9781467301206
DOI	10.1109/NSSMIC.2011.6154105
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-23
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image resolution Modulation Photonics Morphology Single photon emission computed tomography
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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