| http://www.w3.org/ns/prov#value | - Therefore it is an object of the present invention to provide X-ray intensifying screens containing a mixture of at least one yttriumtantalate or niobate phosphor and at least one rare earth activated alkaline earth fluorohalide phosphor which, when X-ray exposed in combination with photographic silver halide emulsion films, provide high image quality, especially sharpness, for each of the differe
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