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Radiography used X-rays or Gamma rays to produce an image of an object on film,An X-ray image can be formed on a fluorescent screen placed behind the specimen,which converts the x-rays to visible light.This is fluoroscopy.
The use of a television system in fluoroscopy reduces the radiation hazard to the operator but the X-ray tube must still be shielded.
Spacical X-ray tubes
have been developed in which the source of X-ray is much smaller than .in a conventional tube.
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