X-ray Film Composition Flashcards
X-ray film layers:
- Base
- Adhesive Coating
- Emulsion
- Protective Coat
Base
- Provide rigidity so it can be coated with emulsion
- Flexible, unbreakable, and easy to handle
What was used for the base in WW1?
Glass
- bad as medical records could be lost due to breaking
Cellulose Nitrate
- 1920s-1930s
- Highly flammable when improperly stored or handled
Cellulose triacetate
- “Safety film” because it was nonflammable
- Prone to warping
- Developed by George Eastman
Polyester
- Used now
- Safety film
- blue tint, flexible, stable
- not prone to warping
Adhesive coating
binds emulsion to base
Emulsion
most important component of x-ray film
What is emulsion composed of?
silver halide crystals suspended in gelatin
Gurney- Mott Theory of Latent Image Formation
a contaminant or sensitivity speck is added to make the crystals respond to the action of X-ray and light
Sensitivity speck gains a ___________ after light photons interact with the __________. Positively-charged silver are drawn to the sensitivity speck resulting in_________.
- negative charge
- crystal
- black metallic silver
Duplitized film is also known as:
Double emulsion
Duplitized film (Double emulsion)
X-ray film has a layer of emulsion on each side of the base
Advantage of Duplitized film (Double emulsion)?
- decreases exposure of radiation due to faster speed
-doesn’t require as much X-ray energy to expose or properly darken the film
Disadvantage of Duplitized film (Double emulsion)?
parallax effect
