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The angular distribution of the light emitted from a fluorescent screen under x-ray excitation is measured as a function of the thickness of the screen for a number of granular phosphors. This angular distribution is found to have a systematic divergence from the Lambertian one. Experimental results are discussed on the basis of a plausible physical model which takes into account the absorption and scattering of the light in the screen. A report is given concerning the magnitude of the errors appearing in the fluorescent screen calculations which are due to using the Lambertian distribution instead of the real one.

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