Abstract
A scintillating screen is an indispensable component of a slow-scan CCD (charge-coupled-device) camera system for transmission electron microscopy. Its performance is therefore of great concern because of its influence on the overall performance of the system. Screens produced by deposition of phosphor on a thin metal foil appear to be attractive particularly for intermediateand high voltage applications. The metal foil serves three purposes: (1) support for the phosphor; (2) charge conductor; and (3) light reflector. Vacuum deposited, thin aluminum foils serve these purposes well. We report here briefly the brightness and resolution of a scintillating screen composed of a 10 μm layer of P20 phosphor deposited on 2 μm Al foil. More detailed characterization of the screen can be found elsewhere. Results are compared to that of a screen made by depositing a similar layer of phosphor onto a glass plate, and that of a 0.5 mm YAG screen.Fig. 1 illustrates schematically the structure of the aluminum screen.
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