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The scintillator effective luminescence efficiency, which may be defined in terms of the scintillator's X-ray luminescence efficiency and the scintillator-photodetector spectral matching and geometrical configuration, was studied for various X-ray imaging applications. Four scintillator materials Gd 2 O 2 S:Tb, Y 2 O 2 S:Tb, ZnSCdS:Ag and CsI:Na were used to prepare test screens. They were evaluated in relation to various photodetectors used in X-ray imaging, such as radiographic films,doi:10.1259/bjr.71.847.9771388 pmid:9771388 fatcat:rqc57u67izamjc32lx75jxj4dy