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Time Evolution of Radiation-Induced Luminescence in Terbium-Doped Silicate GlassA study was made on two commercially available terbium-doped silicate glasses. There is an increased interest in silicate glasses doped with rare-earth ions for use in high-energy particle detection and radiographic applications. These glasses are of interest due to the fact that they can be formed into small fiber sensors; a property that can be used to increase the spatial resolution of a detection system. Following absorption of radiation, the terbium ions become excited and then emit photons via 4f-4f electronic transitions as they relax back to the ground state. The lifetime of these transitions is on the order of milliseconds. A longer decay component lasting on the order of minutes has also been observed. While radiative transitions in the 4f shell of rare-earth ions are generally well understood by the Judd-Olfelt theory, the pr'esence of a longer luminescence decay component is not. Experimental evidence that the long decay component is due, in part, to the thermal release of trapped charge carriers will be presented. In addition, a theoretical model describing the time evolution of the radiation-induced luminescence will be presented.
Document ID
19990113206
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
Authors
West, Michael S.
(College of William and Mary Williamsburg, VA United States)
Winfree, William P.
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 19, 2013
Publication Date
February 12, 1996
Subject Category
Nonmetallic Materials
Distribution Limits
Public
Copyright
Other

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