Processing the Latent Image Flashcards
What may cause an increase in radiographic density?
Rack not rolling properly
Which part of the transport system directs a film from the bottom of a rack back toward the top?
Turnaround assembly
Which system should be inspected if the development time is too long?
Transport system
What applies to a processor with a low workload?
High replenishment rate
A problem of light films is traced to the processor. Which of the following processing conditions is not a probable cause?
Over-replenishment
The normal development temperature for the automatic processor is?
90-95 degrees F
Which major system of the processor would be the most likely cause of films having a brownish appearance?
Replenishment system
The overflow of which processor tank must be specially filtered before going into the sewer system?
Fixer
The microswitches attached to the entrance rollers activate which major system?
Replenishment system
Which major system of the processor is maintained at 120 degrees F?
Drying system
What is lacking if films exit the processor with a greasy appearance and feel?
Wash
An increase in film fog may be caused by all of the following except?
Developer temperature too low
What determines the volume of chemicals pumped into the processor tanks?
Length of film
How often is a sensitometric strip run?
Daily
What is the speed index tolerance?
+ .15
If the developer temperature is too low the film will be?
Light
What turns the film around at the top of the processor tank?
Crossover
The exposed silver bromide crystals are reduced to metallic silver in the?
Developer
Fog on the film may mean?
The developer temperature was too high
What squeezes off excess chemicals before the film travels to the next section of the processor?
Crossover
Which variables should be controlled in the darkroom?
Temperature, humidity, and light
What part of the film contains silver halide crystals?
Emulsion
Film storage temperature that are too high could cause which of the following?
Fogging
What happens when photons interact with silver halide crystals in the film emulsion?
Electrons are freed in the crystals,
Electrons move the sensitivity specks, and
Sensitivity specks gain a negative charge
Approximately how long does it take to develop a film in an automatic processor?
45-90 seconds
When does the latent image appear on the film?
After exposure and before development
What reduces the exposed silver bromide to metallic silver?
Developing agent
What contains potassium bromide?
Restrainer
What is used as a hardener?
Glutaraldehyde
What maintains proper PH in the fixer?
Buffer
What preserves the life of the processing chemicals; maintains balance among developer components?
Sodium Sulfate
What stops the action of the developer?
Activator
What is also called hypo, cleaning agent?
Ammonium thiosulfate
What removes the unexposed and undeveloped silver bromide crystals?
Fixing agent
What is the chemical used as a developing agent; produces black tones slowly?
Hydroquinone
What is the chemical used as a developing agent; develops the gray tones?
Phenidone
Intensifying screens function because of what process?
X-ray photons striking the screen produce light photons
What is needed to convert a latent image into a manifest image?
Develop the film
What controls the replenishment rate?
Entrance rollers
Contaminated developer chemicals must be?
Discarded
Contamination of the processor chemicals occur when?
When the fixer is splashed into the developer
What controls the film-feeding rate?
Entrance rollers
A film with a wide latitude generally has?
The ability to show many shades of gray
The unexposed and undeveloped silver bromide crystals are removed in the?
Fixer
What gets replenished?
Both the developer and the fixer
Which major system of the processor is responsible for mixing chemicals with the processor?
Recirculating system
Not turning on the water to the processor will cause?
Greasy films, because the chemicals would not be washed from the film.
Which major system for the processor is responsible for maintaining chemical strength in the processor?
Replenishing system; it pumps in fresh chemistry each time a film is processed.
how often should the crossover racks be cleaned?
Daily
Which major system of the processor will filter out reaction particles from the developer?
Recirculating system; has filters placed “inline” that filter out impurities from the developer.
Which system draws chemicals from the bottom of the developer and fixer tanks of the processor and returns these chemicals through the side of the tanks?
Recirculating system; this helps to remove reaction particles and byproducts of processing that may settle to the bottom of the tanks.
Guideshoes out of alignment would cause what problems?
Jamming of the processor and Scratches on the flim.
Which method of silver recovery requires a rectifier?
Electrolytic method; uses a DC current passed between diodes and uses a rectifier to convert AC from the power outlet to DC needed fro the process.
Scratched film during processing is most likely caused by which major system of the processor?
Transport system; it moves the film through the processor and any misalignment or buildup on the system can scratch the film.
What should be checked during preventative maintenance?
All moving parts,
All hoses, and
All filters.
Checked with each PM performed.
Which method of silver recovery relies on a base metal filter reacting with the acid of the fixer?
Metallic cartridge method; acts to give up electrons as it reacts with the acid of the fixer.
Which major system of the processor is responsible for removing reaction particles from the film during processing?
Transport system; the movement and action of the rollers of the transport system act to “shake off” reaction particles from the film.
What if lacking if films exit the processor with a milky appearance?
The Fixer; due to an inadequate fixer.
Which component of the transport system directs the film from one tank to the next?
Crossover assembly; they are shaped and positioned to guide the film from one tank to the next.
What determines the amount of chemicals pumped into the processor tanks?
Inches of film (per inch of film); as the film passes through the entrance rollers the replenishing system is activated, so the longer the film, the longer it stays on. The delivery rate is determined to deliver a preselected amount of chemicals per inch of film.
