Source Van Dyk
The cassettes and films used to generate port films are quite different from those found in the simulator. Rather than a high atomic number fluorescent screen, the x-ray detector consists of a front metal plate and a rear plate made of either plastic or metal. The front metal plate acts as a buildup layer that generates high energy electrons, while the rear metal plate acts as an electron backscattering material and as a compression plate to ensure good contact between the film and the surrounding materials.
Most commercially available portal film cassettes use a 1 mm thick copper plate with a curved cassette lid.
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