x-rays

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  • Created by: siobhan
  • Created on: 22-05-13 14:23
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  • X-rays
    • x-rays are part of the electromagnetic spectrum. They have a high frequency and a very short wavelength (Their wavelength is about the same size as the diameter of an atom)
    • Properties of an x-ray
      • they affect a photographic film in the same way as light
      • they are absorbed by metal and bone
      • they are transmitted by healthy tissue
    • x-rays are used to form images of bones on photographic film to check for fractures and dental problems
    • Charger-coupled devices (CCDs) can be used to form electronic images of X-rays. CT scanners use x-rays to produce digital images of a cross-section through the body. Some body organs made of soft tissue, such as intestines, can be filled with a contrast medium that absorbs x-rays so the can be seen on an x-ray image
    • x-rays cause ionisation and can damage living tissue when they pass through it, therefore precautions must be taken when using them. Worker should wear film badges and when possible use lead screens to shield them from x-rays.
    • x-rays may also be used for therapy. They can be used to treat cancerous tumours at or near the body surface.

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