PERFORMANCE OF THIN FOIL SCINTILLATING SCREEN FOR TRANSMISSION ELECTRON-MICROSCOPY

Scintillating screens made by coating a thin metal foil with a layer o f phosphor appear to be attractive for transmission electron microscop y applications. We report here the brightness and resolution in the vo ltage range of 100-400 kV of such a screen made of a 10 mu m layer of P20 phosphor on a 2 mu m Al foil. Both brightness and resolution are s uperior to that of a screen made by coating a glass plate with a simil ar layer of phosphor. An exciting property of such a device is that it s resolution improves slightly at higher voltages. This, combined with its excellent resistivity to radiation damage and stability under the electron beam, makes it a good candidate for high-voltage application s.