title: X-ray absorption, speed, and luminescent efficiency of rare earth and other intensifying screens.
abstract: Seven new and two conventional screens were investigated. Measurements were performed at different energies of the photon fraction interacting in the screens, and energy losses due to escape of K-fluorescent radiations were calculated. The speed of the screens was dependent on the energy; this was primarily due to the fact that x-ray absorption is dependent on energy. Rare earth and other new screens absorb a maximum of 1.5 times as much energy and emit twice as much light as comparable calcium tungstate screens. Reabsorbed K-fluorescent radiations might contribute to image unsharpness in the new screens.
mesh_terms: D017610:Calcium Compounds; D004601:Elementary Particles; D005453:Fluorescence; D006801:Humans; D008163:Luminescent Measurements; D008674:Metals, Rare Earth; D055585:Physical Phenomena; D010825:Physics; D011859:Radiography / Q000295:instrumentation*; D014414:Tungsten; D017973:Tungsten Compounds; D014965:X-Rays
chemical_list: D017610:Calcium Compounds; D008674:Metals, Rare Earth; D017973:Tungsten Compounds; C018858:calcium tungstate; D014414:Tungsten