| 摘要 |
<p>A plasma source of soft x-rays provides the illumination for a microfluoroscope. In general, an x-ray relay optic (c) collects part of the diverging plasma (x) radiation and redirects it to a distant plane. At that plane, the fine-grained or grainless fluorescent screen (F) of a microfluoroscope is placed to receive the radiation. A specimen (S) is placed in direct contact with the screen (F), or in very close proximity, so that its x-ray shadow is projected onto the screen (F). The screen (F) is very thin and transparent to visible or ultraviolet light so that a high-numerical-aperture optical microscope objective can closely approach and view the screen from the opposite side. The optical microscope (Y) views the fluorescent light emitted by the screen (F), which corresponds to the x-ray absorption shadow of the specimen. In general, a very thin x-ray transparent vacuum window (Ws) is used to separate the specimen fluorescent screen (F), and microscope from the vacuum of the plasma source.</p> |
