In:
MRS Proceedings, Springer Science and Business Media LLC, Vol. 375 ( 1994)
Abstract:
Cerium activated glasses of composition 20Li 2 O·15MO·64.4SiO 2 ·0.6Ce 2 O 3 (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 L III 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 Ce 4+ . The area of this peak is, in fact, correlated with the scintillation efficiency of the glass. The amount of Ce 4+ 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 Ce 4+ and trapped electrons due to photoionization by the x-ray beam.
Type of Medium:
Online Resource
ISSN:
0272-9172
,
1946-4274
DOI:
10.1557/PROC-375-241
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1994
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