What is the primary function of the screen in an X-ray cassette?

The primary function of the screen in an X-ray cassette is to decrease the exposure necessary to create an image on the film. Screens are designed to emit light when they are exposed to X-rays. This emitted light then exposes the film, allowing for the production of images with much less radiation compared to using film alone. By converting X-ray energy to visible light, screens help to enhance the film's sensitivity, thereby reducing the overall dose of radiation required to produce a diagnostic-quality image.

This effectiveness means that less time or fewer X-ray photons are needed to create an adequate exposure, which is a crucial factor in patient safety as it minimizes exposure to ionizing radiation. The screens also help improve efficiency in imaging procedures.