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Characterizations of a Hot-Pressed Polycrystalline Spinel:Ce Scintillator

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Here, we report a new polycrystalline ceramic scintillator for possible use in -ray detection and medical imaging applications. The goal was to develop a cerium-doped spinel (MgAl2O4:Ce), which can be processed utilizing ceramic forming techniques. High-purity MgAl2O4 powders were used as the starting materials. Lithium fluoride (LiF) was used as a sintering aid and CeO2 powder was used as the dopant. The mixed and dried powders were hot pressed in a vacuum environment to achieve high-density MgAl2O4:Ce. The hot-pressed sample shows a transparent polycrystalline appearance. In-line transmission was measured to determine the transparency of the structure. Microstructures were characterized using X-ray diffraction and scanning electron microscopy. Fluorescence absorption and emission peaks were also measured in addition to the decay time measurement.
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Document Type: Research Article

Affiliations: 1: Los Alamos National Laboratory, Materials Science Technology Division, Los Alamos, New Mexico 87545 2: Sandia National Laboratories, Livermore, California 94511 3: MER Corporation, Tucson, Arizona 85706 4: Sandia National Laboratories, Albuquerque, New Mexico 87185

Publication date: August 1, 2010

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