Film Construction
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| show | william talbot in 1840
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| show | base & emulsion
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| show | 0.2 mm
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| Why is the base tinted blue? | show 🗑
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| show | to provide support for the film emulsion
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| show | silver bromide suspended in gelatin
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| What type of emulsion is used in x-ray film? | show 🗑
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| show | silver bromide (AgBr)
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| show | digestion
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| Why is gelatin used in emulsion? | show 🗑
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| WHat does colloid mean? | show 🗑
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| show | calves skin and bones
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| show | parallax motion-a slight distortion of the image
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| The speed of the film is increased by doing what to the size of the crystals or thickness of the emulsion? | show 🗑
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| show | impairs
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| Which grain emulsions are the fastest? | show 🗑
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| What types of crystals are flat with the flat side facing the x-ray tube? | show 🗑
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| show | the flatness of the t-grain allows the crystals to capture more light with out the need of thickening the emulsion
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| What charge do bromide ions ( Br-) have and why? | show 🗑
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| WHat charge do silver ions(Ag+) have and why? | show 🗑
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| -invisible image in the film emulstion that is made visible upon development | show 🗑
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| show | at the sensitivity speck located in the emulsion
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| At crystal level, what is the latent image? | show 🗑
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| show | the film is immersed in developer chemicals of the processor
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| show | visible
manifest
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| show | negative
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| In a radiographic image, the "shadows" are which part? | show 🗑
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| show | where the x-rays were not stopped and passed through to expose the film
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| What is the most common type of film? Why? | show 🗑
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| Blue sensitive film responds to what kind of light? | show 🗑
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| show | blue and green light from rare earth screens
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| show | in the darkroom
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| An exposure as low as ____ mR can caused detectable film fog. | show 🗑
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| show | maze or labyrinth
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| show | revolving door
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| What is the working distance from the safelight? | show 🗑
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| show | 15 watts
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| How is a safelight test preformed? | show 🗑
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| How do you read the results of a safelight test? | show 🗑
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| -marks or surious images that sometimes appear on the processed radiograph | show 🗑
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| show | before
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| show | after
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| show | heat
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| Radiographic film should not be stored at temperatures in excess of? | show 🗑
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| show | 10 deg C ( 50deg F)
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| show | btwn 40-60%
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| Above ____% humidity and contrast will be reduced and fog increased | show 🗑
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| Below __% humidity and there is an increase in static artifacts | show 🗑
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| show | tree/branch
crown
smudge
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| show | monthly
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| What is the reasonable max storage time for radiographic film? | show 🗑
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| show | sensitrometry
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| THe fog level of unprocessed film is approx ___ mR | show 🗑
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| show | Characteristic curve
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| show | 5 - 1000 mR
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| show | exposure and processing
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| -shows the lightest portion of the film | show 🗑
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| -shows the darkest portion of the film | show 🗑
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| show | straight line portion
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| What is past the shoulder of the curve? | show 🗑
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| show | the darkest area on the curve
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| show | Solarization point
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| show | pentrometer
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| show | densitometer
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| show | latent image formation
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| show | sensitometer
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| Unexposed radiographic film has an optical density in the range of what? | show 🗑
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| Base density usually has a value of what? | show 🗑
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| show | 0.05
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| show | 0.2
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| What is the useful range of optical density? | show 🗑
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| show | 0.5 - 1.25
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| At what point is the optical density too dark to see anything? | show 🗑
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| show | straight line portion
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| show | steeper
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| -the ability of an x-ray film to respond to a min quantity of x-ray exposure is a measure of what? | show 🗑
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| show | 1 divided by roentgens needed to produce an optical density of 1
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| show | left
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| show | latitude
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| contrast and latitude are _____ proportional. | show 🗑
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| show | steeper
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| The ____ the straight line portion, the higher the contrast. | show 🗑
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| What 4 things does the characteristic curve show? | show 🗑
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| Where does the greatest amt of variation occur? | show 🗑
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| Processing control charts monitors what 3 factors? | show 🗑
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| show | 35%
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| What 2 things do processing control charts reduce? | show 🗑
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