The absolute efficiency of X-ray phosphor screens was studied in reflection mode observation for two phosphor materials widely used in X-ray applications, namely Y2O2S:Tb and Gd2O2S:Tb. The efficiency proved to depend on the tube voltage and on the screen thickness. Comparisons are given between the efficiency of the same screens in reflection and transmission mode observation. Theoretical calculations based on a uniform screen model give results that are in very good agreement with the experimental data.
The x-ray luminescence of Y2O2S:Eu phosphor screens is studied both in transmission and in reflection mode observation. Detailed experimental data concerning the dependence of the absolute efficiency on the tube voltage and the screen's thickness are presented and comparisons to another rare earth phosphor material (Y2O2S:Tb) are given. With the help of theoretical calculations based on the Hamaker-Ludwig model all the experimental data are explained and the intrinsic efficiency and scattering coefficients of the phosphor are estimated.
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