Rare-earth screens versus calcium tungstate screens.
D017610:Calcium Compounds; D008674:Metals, Rare Earth; D011856:Radiographic Image Enhancement / Q000295:instrumentation; D014414:Tungsten; D017973:Tungsten Compounds; D014963:X-Ray Intensifying Screens
D017610:Calcium Compounds; D008674:Metals, Rare Earth; D017973:Tungsten Compounds; C018858:calcium tungstate; D014414:Tungsten