06 processing, errors, mounting procedures, and QA Flashcards
in an automatic processor, what are the different stages that the film progresses through?
-developer, fixer, wash and dryer cycles
what type of light is film most sensitive to?
Blue and green light
what type of filter should be used on lights near film?
red GBX-2 filter
what does developer do?
makes latent image visible
What does fixer do?
preserves image and dissolves unexposed silver halide crystals
what is the purpose of rise water?
removes all chemicals
If fixer were to stay on film…
it would eventually change deposited black silver to brown silver sulfide
what are the components of developer?
- reducing agents: phenidone and hydroquinone
- activator: sodium carbonate and sulfates to swell emulsion so reducing agents can act more effectively
- restrainer: potassium bromide, acts to prevent fog
- preservative: sodium sulfite, prevents rapid oxidation of reducing agents
what are the components of Fixer?
- fixing agent: ammonium thiosulfate (hypo), clears away unexposed silver halide crystals
- acidifier: acetic acid, stops develpment by neutralizing developer
- hardener: aluminum salts, shrinks and hardens the emulsion
- preservative: sodium sulfite, maintains chemical balance of fixer chemistry
what is the total processing time in automatic processing
83 degrees for 4.5 minutes
-in order to maintain high quality rads, automatic processors MUST be disassembled, cleaned, lubricated and solutions changed…
weekly
how are radiographs duplicated?
- duplication film designed to be used with ultraviolet light
- film held in close contact with emulsion side of single coated duplicating film to avoid blurring
- takes place in a dark room
how does a duplicated rad compare to the original?
the duplicate will have lower resolution and higher contrast than the original
