(AQA GCSE P3.1.1) X-Ray Machines and CT Scanners

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  • Created by: Em
  • Created on: 18-04-13 20:11
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  • X-Ray Machines and CT Scanners
    • X-ray machines
      • How do they work?
        • Body part e.g. is put in front of photographic film, photographic film is white but turns black when hit by x-rays.
          • X-rays absorbed by bones so where they do not pass through and hit the film, it stays white.
            • This means fractures in bones can be seen and cavities in teeth.
      • Advantages
        • Cheaper than CT
        • Lower dose than CT scanners, less dangerous
      • Disadvantages
        • Image produced is 2D and not very detailed
    • CT scanners
      • How do they work?
        • Machine which is basically an x-ray tube. Person is inside this tube.
          • An x-ray emitter rotates around the tube so x-rays will hit the person in all directions.
            • Connect it to a CCD (charge-coupled device) which converts x-rays to light and the image can appear on a screen.
      • Advantages
        • Detailed 3D image, distinguishes between hard and soft tissue
      • Disadvantages
        • Higher dose of x-rays needed, costly and more dangerous
        • Expensive
    • SAFETY
      • Due to ionization, people who work in close contact with x-rays on a regular basis can use lead shielding. Lead absorbs x-rays.
      • Film badges can also be used, they have film inside and the case is plastic so x-rays pass through and hit the film. The film is then checked and if it is too dark it could mean dangerous doses of x-rays.


Miss KHP

This is a really good mindmap that can be used with AQA Triple Science- Physics students. Mindmaps are a great way to organise your thinking into different sections to make it easier to remember a big chunk of learning. Once you have learnt everything from the mind map, there is an opportunity to test youself.

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