ISSN 2398-2985      

Radiography: processing

Jreptile

Formation of the latent image

  • When film is exposed to x-rays and light from intensifying screens the silver halide crystals are affected forming the latent image.
  • The latent image is not visible since, although the reduction of silver halide to metallic silver has begun, there is not enough of this to appear black.
  • The silver halide in the emulsion is in the form of a crystal lattice containing (negative) bromide ions and (positive) silver ions.
  • Some of these ions are free to move within the crystal lattice.
  • Around the crystal lattice is a "barrier" of electrons.
  • During manufacture, a defect is introduced into the crystal → sensitivity speck .
  • When the film is exposed to ionizing radiation: 
    • Some of the bromide ions in the lattice emit electrons.
    • These electrons travel rapidly to the sensitivity speck which acts as an electron trap.
    • The electron trap builds up a negative charge.
    • Silver ions are attracted to the negative charge.
    • The positive charge of the silver ions is neutralized by the electrons in the trap (reduction) and silver atoms are produced.
    • The presence of metallic silver in the crystal lattice makes a break in the electron barrier which surrounded it and it is therefore susceptible to the action of developer.

Development

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Rinsing

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Fixing

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Washing

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Drying

This article is available in full to registered subscribers

Sign up now to obtain ten tokens to view any ten Vetlexicon articles, images, sounds or videos, or Login

Further Reading

Publications

Refereed Papers

Can’t find what you’re looking for?

We have an ever growing content library on Vetlexicon so if you ever find we haven't covered something that you need please fill in the form below and let us know!

 
 
 
 

To show you are not a Bot please can you enter the number showing adjacent to this field

 Security code