Efficiency Of Rare-Earth Phosphors As A Function Of Temperature

Douglas R Shearer; Stephen Kimball

doi:10.1117/12.939328

15 June 1984 Efficiency Of Rare-Earth Phosphors As A Function Of Temperature

Douglas R Shearer, Stephen Kimball

Author Affiliations +

Proceedings Volume 0454, Application of Optical Instrumentation in Medicine XII; (1984) https://doi.org/10.1117/12.939328
Event: Application of Optical Instrumentation in Medicine XII, 1984, San Diego, United States

Abstract

The x-ray to light conversion efficiencies of several commercially available screens were determined over a temperature range of 0 - 50°C using 80 kVp x-rays generated from a diagnostic fluoroscopic x-ray unit. The efficiencies of the rare-earth screens investigated (LaBrO:Tb & La2C2S/Gd202S:Tb) varied by less than 5% over this temperature range whereas that of the conventional screen (BaPb604) dropped to approximately 60% of the value at 00C. This slight temperature dependence for the terbium activated phosphors is ascribed to the weak coupling of the host crystal lattice with the inner electron shells involved in the luminescence transitions.

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Douglas R Shearer and Stephen Kimball "Efficiency Of Rare-Earth Phosphors As A Function Of Temperature", Proc. SPIE 0454, Application of Optical Instrumentation in Medicine XII, (15 June 1984); https://doi.org/10.1117/12.939328

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