X-Rays

X-Rays

1. Part of the electromagnetic spectrum.

   • They have a high frequency and a very short wave length.

2. Properties:

   • They affect a photographic film in the same way as light.
     • They are absorbed by metal and bone.
       • They are transmitted by healthy tissue.

3. Used to form images of bones on photographic film.

4. Used to check for fractures and dental problems.

5. Charged-coupled devices (CCDs) can be used to form electronis images of x-rays.

6. CT Scans

   • Use x-ray to produce digital images of a cross section through the body.
   • Some body organs made of soft tissue can be filled with a contrast medium that absorbs X-rays so that they can be seen on an X-ray image.
     • E.g The Intestines

7. X-rays cause ionisation and can damage living tissue when they pass through it.

   • Therefore precautions are taken; workers wear film badges and when possible use lead screens to shield them from the X-rays.

8. X-rays may also be used for therapy.

   • They can be used to treat cancerous tumours at or near the body surface.