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Proceedings Paper

Performance of new ceramic scintillators for gamma- and x-ray detection
Author(s): Dariusz J. Wisniewski; Lynn A. Boatner; John S. Neal; Gerald E. Jellison; Joanne O. Ramey; Andrea North; Monika Wisniewska; Aleksander Lempicki; Charlie Brecher; Jaroslaw Glodo
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Paper Abstract

Ceramic materials show significant promise for the production of reasonably priced, large-size scintillators. Ceramics have recently received a great deal of attention in the field of materials for laser applications, and the technology for fabricating high-optical-quality polycrystalline ceramics of cubic materials has been well developed. The formation of transparent ceramics of non-cubic materials is, however, much more difficult as a result of birefringence effects in differently oriented grains. Here, we will describe the performance of a few new ceramics developed for the detection of gamma- and x-ray radiation. Results are presented for ceramic analogs of three crystalline materials - cubic Lu2O3, and non-cubic LaBr3, and Lu2SiO5 or LSO (hexagonal, and monoclinic structures, respectively). The impact of various sintering, hot-pressing and post-formation annealing procedures on the light yield, transparency, and other parameters, will be discussed. The study of LaBr3:Ce shows that fairly translucent ceramics of rare-earth halides can be fabricated and they can reach relatively high light yield values. Despite the fact that no evidence for texturing has been found in our LSO:Ce ceramic microstructures, the material demonstrates a surprisingly high level of translucency or transparency. While the scintillation of LSO:Ce ceramic reaches a light yield level of about 86 % of that of a good LSO:Ce single crystal, its decay time is even faster, and the long term afterglow is lower than in LSO single crystals.

Paper Details

Date Published: 1 October 2007
PDF: 12 pages
Proc. SPIE 6706, Hard X-Ray and Gamma-Ray Detector Physics IX, 670619 (1 October 2007); doi: 10.1117/12.734440
Show Author Affiliations
Dariusz J. Wisniewski, Oak Ridge National Lab. (United States)
Lynn A. Boatner, Oak Ridge National Lab. (United States)
John S. Neal, Oak Ridge National Lab. (United States)
Gerald E. Jellison, Oak Ridge National Lab. (United States)
Joanne O. Ramey, Oak Ridge National Lab. (United States)
Andrea North, Univ. of Tennessee, Knoxville (United States)
Monika Wisniewska, Oak Ridge National Lab. (United States)
Aleksander Lempicki, ALEM Associates (United States)
Charlie Brecher, ALEM Associates (United States)
Jaroslaw Glodo, Radiation Monitoring Devices, Inc. (United States)

Published in SPIE Proceedings Vol. 6706:
Hard X-Ray and Gamma-Ray Detector Physics IX
Ralph B. James; Arnold Burger; Larry A. Franks, Editor(s)

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