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US4283632A Electron beam aperture device 失效
电子束孔径装置

Electron beam aperture device
摘要:
A 10 to 50 microns thick apertured foil is coated on at least one of its sides with a material having a thickness of about 10 to 100 microns. The atomic number of the coating material is such that characteristic X-rays generated are effectively absorbed.
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