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In page X-ray:

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  • X-ray astronomy, an observational branch of astronomy that studies X-ray emission from celestial objects.[2]
  • X-ray microscopic analysis, which uses electromagnetic radiation in the soft X-ray band to produce images of very small objects.[citation needed]
  • X-ray fluorescence, a phenomenon that occurs when a sample is hit with high-energy X-rays. The sample fluoresces with a radiation profile that is characteristic of its atomic makeup. This provides a means for non-destructive analysis of many different things.[3][4][5]