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film processing-DENH

QuestionAnswer
What appears on radiographs after being exposed? latent image
What does exposure entail? x-ray beam, density of object, and sliver bromide crystals
What occurs to the silver bromide after exposure? they are energized from the radiation
What are the 3 components of processing? developer, fixer, and washing
What does developer do to film? softens gel, reduces silver halide crystals by precipitation of silver
Which component is acidic and which is alkalinic? Fixer is acidic and developer is alkalinic
what does elon and hydroquinone do? reduces silver bromide to silver
what does sodium carbonate do? softens gel to allow hydroquinone to reach silver bromide and maintains alkalinity
what does potassium bromide do? prevents chemical fog (sometimes)
what does sodium sulfite do? preservative
what is manual developer dependent on? temperature: if high, decrease processing time; if low, increase processing time
What is special about fixer? it needs to be recycled due to the silver
what does sodium thiosulfate do? removes remaining silver bromide from emulsion
what does sodium sulfate do? prevents decomposition of thiosulfate
what does potassium aluminum do? shrinks/hardens gelatin (emulsion)
what does acetic acid do? maintains acidity
If using manual fixer, what needs to happen to the developing time? double developer time (minimum of 10 min)
how long must it stay in the fixer for a wet read? 3 minutes
what can occur if inadequate fixing happens? brown film
what does washing do? stops developer, remoes developer so fixer is not contaminated
if a manual process is used, how long is film washed? twice as long as it is fixed (minimum 20 min)
what can occur if film is overagitated during any of the processes? removes image from film
what is rapid processing used for? endodontics and post-operative
what kind of image is produced using rapid processing? inferior in density and definition to standard method
what are the 4 steps of automatic processing? developer, fixer, wash, dryer
what is standarized processing involve? solution strength, temp, and time = increased quality control
what 3 items need to be recycled? lead foil, fixer solution, and non-diagnostic radiographs
what determines film speed? size of crystals; larger=faster
what occurs due to larger crystals? decrease definition
what is the main advantage of an automatic processor? standardization
as film speed increases, sensitivity _____. increases, which decreases exposure time
what size of film is occlusal? 4
PROCESSING SLOUTIONS SHOULD BE CHANGED EVERY? 2-3 WEEKS
FILM EXPOSURE TEST UTILIZING A "STEP WEDGE" EVALUATES WHAT? SOLUTION STRENGTH
EXHAUSTED PROCESSING SOLUTION CAN CAUSE WHAT? FOG
WHAT IS THE FASTEST FILM SPEED? F
LIGHT LEAKS IN THE DARKROOM RESULT IN _____ ON THE FILM. FOG
AS SILVER PRECIPITATION INCREASES, FILM BECOMES WHAT? DARKER/ MORE RADIOLUSCENT
SILVER BROMIDE CRYSTALS ON A FILM THAT LIES BEHIND A CROWN RECIEVES HOW MUCH RADIATION? MINIMAL/LESS
A SIMPLE TEST USED TO CHECK THE SAFETY LIGHT IS CALLED? COIN TEST
THE MAIN FUNCTION OF LEAD FOIL IN THE FILM PACKET IS TO WHAT? ABSORB RADIATION
OBJECT MAGN INCREASES WHEN OFD IS? INCREASED
TO COMPENSATE FOR THE DECREASE IN IMAGE SHARPNESS THAT RESULTS FROM INCREASING OFD, WHAT IS INCREASED ALSO? FFD
IMAGE DETAIL IS DEPENDENT IN FILM _____ SHARPNESS
FILM DEFINITION IS AKA? DETAIL
ONE EFFECT OF SECONDARY RADIATION ON FILM IS? FOG
THE FFD OF ____ INCHES PRODUCES THE LEAST AMT OF MAGN 16
Created by: 564399687