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Correlation of Xanes Features with the Scintillation Efficiencies of Ce Doped Alkaline Earth Lithium Silicate Glasses

Published online by Cambridge University Press:  15 February 2011

D L Blanchard ,
D S Sunberg ,
R A Craig ,
M Bliss  and
M J Weber
D L Blanchard
Affiliation:
Pacific Northwest Laboratory, Box 999, Richland, WA 99352
D S Sunberg
Affiliation:
Pacific Northwest Laboratory, Box 999, Richland, WA 99352
R A Craig
Affiliation:
Pacific Northwest Laboratory, Box 999, Richland, WA 99352
M Bliss
Affiliation:
Pacific Northwest Laboratory, Box 999, Richland, WA 99352
M J Weber
Affiliation:
Livermore National Laboratory, Livermore, CA 94551
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Abstract

Cerium activated glasses of composition 20Li2O·15MO·64.4SiO2·0.6Ce2O3 (where M is Mg, Ca, Sr, or Ba) exhibit scintillation efficiencies that vary by more than a factor of 2.5 with the alkaline earth. Previous work has suggested a correlation between the microstructure of these glasses and scintillation efficiency. Measurements of the Ce LIII x-ray absorption edge in the Mg, Ca and Sr glasses display a feature near the absorption edge that is suggestive of the presence of Ce4+. The area of this peak is, in fact, correlated with the scintillation efficiency of the glass. The amount of Ce4+ indicated by the intensity of this feature is, however, too high to be a permanent population. We suspect that the feature is a transient phenomenon related to creation of Ce4+ and trapped electrons due to photoionization by the x-ray beam.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 375: Symposia AA – Applications of Synchrotron Radiation Techniques to Materials Science , 1994 , 241
Copyright
Copyright © Materials Research Society 1995

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