Electron microscope used in biology and medicine has a fluorescent screen having a phosphor layer made of zinc sulfide: copper, aluminum or zinc sulfide: copper, aluminum, gold

摘要

Electron microscope comprises a vacuum vessel; an electron emitter for producing an electron beam; a device for focusing and deviating the electron beam and a fluorescent screen having a phosphor layer made of ZnS: Cu, Al or ZnS: Cu, Al, Au. Preferred Features: The phosphor layer has an average grain size d of 1.0-4.0 mu m and contains 0.01-0.2 wt.% ZnO and 0.0-50.8 wt.% SiO2.