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Proceedings Paper

Transparent garnet ceramic scintillators for gamma-ray detection
Author(s): Yimin Wang; Gary Baldoni; William H. Rhodes; Charles Brecher; Ananya Shah; Urmila Shirwadkar; Jarek Glodo; Nerine Cherepy; Stephen Payne
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Paper Abstract

Lanthanide gallium/aluminum-based garnets have a great potential as host structures for scintillation materials for medical imaging. Particularly attractive features are their high density, chemical radiation stability and more importantly, their cubic structure and isotropic optical properties, which allow them to be fabricated into fully transparent, highperformance polycrystalline optical ceramics. Lutetium/gadolinium aluminum/gallium garnets (described by formulas ((Gd,Lu)3(Al,Ga)5O12:Ce, Gd3(Al,Ga)5O12:Ce and Lu3Al5O12:Pr)) feature high effective atomic number and good scintillation properties, which make them particularly attractive for Positron Emission Tomography (PET) and other γ- ray detection applications. The ceramic processing route offers an attractive alternative to single crystal growth for obtaining scintillator materials at relatively low temperatures and at a reasonable cost, with flexibility in dimension control as well as activator concentration adjustment. In this study, optically transparent polycrystalline ceramics mentioned above were prepared by the sintering-HIP approach, employing nano-sized starting powders. The properties and microstructures of the ceramics were controlled by varying the processing parameters during consolidation. Single-phase, high-density, transparent specimens were obtained after sintering followed by a pressure-assisted densification process, i.e. hot-isostatic-pressing. The transparent ceramics displayed high contact and distance transparency as well as high light yield as high as 60,000-65,000 ph/MeV under gamma-ray excitation, which is about 2 times that of a LSO:Ce single crystal. The excellent scintillation and optical properties make these materials promising candidates for medical imaging and γ-ray detection applications.

Paper Details

Date Published: 24 October 2012
PDF: 8 pages
Proc. SPIE 8507, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV, 850717 (24 October 2012); doi: 10.1117/12.956437
Show Author Affiliations
Yimin Wang, Radiation Monitoring Devices, Inc. (United States)
Gary Baldoni, Radiation Monitoring Devices, Inc. (United States)
William H. Rhodes, ALEM Associates (United States)
Charles Brecher, ALEM Associates (United States)
Ananya Shah, Radiation Monitoring Devices, Inc. (United States)
Urmila Shirwadkar, Radiation Monitoring Devices, Inc. (United States)
Jarek Glodo, Radiation Monitoring Devices, Inc. (United States)
Nerine Cherepy, Lawrence Livermore National Lab. (United States)
Stephen Payne, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 8507:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV
Ralph B. James; Arnold Burger; Larry A. Franks; Michael Fiederle, Editor(s)

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