title: The effect of phosphor K x-rays on the MFT of rare-earth screens.
abstract: The LSF's and MTF's of two high resolution rare-earth screen-film combinations were measured at two beam qualities. The two beam qualities were chosen to provide x-ray spectral distributions either above or below the K-edge of the screen phosphor. The LSF's were found to be photon energy dependent. This energy dependence is attributed to the generation and reabsorption of phosphor K x-rays resulting in a broadening of the LSF.
mesh_terms: D008163:Luminescent Measurements; D008674:Metals, Rare Earth; D008962:Models, Theoretical; D011856:Radiographic Image Enhancement; D014965:X-Rays
chemical_list: D008674:Metals, Rare Earth