Sensitization of the photostimulable x-ray storage-phosphor CsBr:Eu{sup 2+} following room-temperature hydration
- Institute of Materials Science, Electronic Materials Division, Darmstadt University of Technology, 64287 Darmstadt (Germany)
The x-ray storage-phosphor CsBr:Eu{sup 2+} has been found to exhibit a strong increase in photostimulated-luminescence (PSL) intensity following hydration at room temperature. The sensitivity increases by a factor of 25 following a 60 min exposure to an atmosphere of 99% relative humidity, which is considered to be due to an incorporation of H{sub 2}O molecules within the CsBr:Eu{sup 2+} matrix, which are orientated by and enhance the electric fields surrounding (Eu{sup 2+}-O{sup 2-})-dipoles, increasing their charge trapping cross sections. Following irradiation the PSL increase is accompanied by the formation of mobile V{sub K}-centers, which decrease the F-center population by a recombination process, which appear as an intrinsic 360 nm emission from the CsBr matrix in low temperature thermoluminescence measurements.
- OSTI ID:
- 21190114
- Journal Information:
- Journal of Applied Physics, Vol. 105, Issue 7; Other Information: DOI: 10.1063/1.3103318; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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