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DARKROOM AND FILM

UNIT 3

QuestionAnswer
Neutralizes the developer (activator) Acetic Acid
Produce shades of gray rapidly Phenidone
Archival quality Permanence of image
Removes undeveloped AgBr (clearing agent) Ammonium Thiosulfate
Antifog agent (restrainer) Potassium Bromide
Produces black tones slowly Hydroquinone
Normal developer temperature 95 degrees F
Controls Oxidation (preservative) Sodium Sulfite
Helps swell gelatin Sodium Carbonate
Fixer in developer Contamination
Shrinks and stiffens emulsion (hardener) Potassium Alum
Dissolves chemicals for use (solvent) Water
Regularly spaced scratches Guide shoe marks
Bending of film Crescent Marks
No X-ray exposure Blank film
Oxidized solutions with air Aerial oxidation
Poor screen film contact Blurred image
Film stacked improperly Pressure marks
Branch or treelike mark Static
Film age expired Fog
Which layer of intensifying screen is closest to the film? Protective layer
Which layer of the intensifying screen is the farthest from the film? Base
What is the term generally used to describe the emission of light from a substance as a result of external stimulation? Luminescence
What is the term specifically used to describe the emission of light during and after external stimulation? Phosphorescence
What is the term specifically used to describe the emission of light during stimulation only? Fluorescence
What is measured by comparing an exposure without an intensifying screen to an exposure with an intensifying screen? Intensification factor
What does the term image noise describe? An image with noticeable quantum mottle
What is the outermost layer of radiographic film called? Supercoat
What are the physical imperfections in the emulsion layer of radiographic film called? Sensitivity Specks
What kind of radiographic film is designed to respond specifically to x-radiation and not to the light emitted from intensifying screens? Direct exposure film
When a film has the emulsion coated on both sides of the base versus one side of the film is referred to as: Double exposure film
What influences the speed of radiographic film? The number of silver halide crystals in the emulsion and the size of the silver halide crstals
What is achieved when the color of light emitted by an intensifying screen matches the color of light a film responds to? Spectral matching
What is the purpose of the intensifying screen? To reduce the amount of exposure
Increasing the thickness of the phosphor layer: Increases speed, decreases recorded detail, and decreases patient dose
What is used to assess screen film contact? Wire mesh test tool
The front or tube side of radiographic cassettes should be made of a material that: Absorbs very little of the x-ray beam
At what stage does the process of removing unexposed and undeveloped silver halide from the emulsion occur: Fixing
What is the component of the developer solution responsible for the gray areas on the image? Phenidone
What component of the developer solution helps control the hardening of the emulsion? Glutaraldehyde
What is the chemical in the developer solution that softens the emulsion? Sodium Hydroxide
What is the chemical in the developer solution that controls aerial oxidation? Sodium Sulfite
What is the chemical in the developer solution responsible for the black tones on the image? Hydroquinone
What is the reducing agent in the developer solution? Hydroquinone
Whatis the preservative agent in the developer solution? Sodium Sulfite
What is the restrainer in the developer solution? Potassium Bromide
What is the solvent in the developer solution? Water
What is the hardener in the developer solution? Glutaraldehyde
What is the reducing agent in the developer solution? Phenidone
What is the activator in the fixer solution? Acetic Acid
What is the hardener in the fixer solution? Aluminum Chloride
What is the fixer in the fixer solution? Ammonium Thiosulfate
What prevents oxidation in the developer solution? Sodium Sulfite
What stops development of the film? Acetic Acid
If film begins to yellow after being in storage for a long time, there might be a problem with which stage of the processing cycle? Wash
What removes excess chemistry from the film prior to its entering into the next tank in the processor? Squeegee roller
Which rack system guides the film from one tank into the next? Crossover rack
Which system best achieves agitation, continuous mixing, and filtration of the processing solutions? Circulation system
Created by: jhasenstab