Abstract
The x‐ray absorption of rare earth (gadolinium‐lanthanum) and medium speed calcium tungstate screens was measured in regions of high and low radiographic density of a chest phantom. The ratio of absorptions for the two regions was higher for the rare earth screens. This confirms by direct measurement that the higher observed radiographic contrast for the rare earth screens when compared to calcium tungstate screens is caused by the change in absorption of the screen phosphors with change in transmitted beam quality. The net effect in rare earth screens of this type is a reduction in the recording of scattered radiation with an increase in the percentage of information‐containing (primary) radiation. The degree of this effect is a function of the amount of scattered radiation in the transmitted beam incident on the cassette.
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