XR202 Darkroom

Card Set Information

Author:
Shutrbug20
ID:
90830
Filename:
XR202 Darkroom
Updated:
2011-06-15 22:39:00
Tags:
Processing
Folders:

Description:
Chapter 12 LR Book
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  1. Darkroom Temperature
    • 60-70deg F
    • 40-60% Humidity
  2. Latent Image
    Invisible image after exposure to radiation beam
  3. Manifest Image
    Visible image after processed
  4. Film
    • 2 Parts
    • Base and Emulsion
    • Surrounded by protective covering of gelatin called Supercoating
    • 95% Silver Halide
    • 5% Silver Iodide
    • Double Emulsion (on both sides)
  5. Film
    Characteristics
    • Speed
    • Contrast
    • Resolution
  6. Photoelectric Interaction
    Transfer of info from radiation to emulsion
  7. Ionized Silver Halide Crystals
    Change to black grains during developing
  8. Screen-Type Film
    • Less rads exposure to patient
    • Sensitive to light
  9. Screen-Type Film
    3 Characteristics
    • Contrast (High = B&W, Low = gray shaded)
    • Speed (sensitivity)
    • Light absorption (high speed = thick emulsion, lg crystals, decreased visibility)
  10. Spectral Absorption or
    Spectral Matching
    Use of film whos sensitivity matches light spectrum of screen
  11. Blue Sensitive Film
    Amber safe light
  12. Green Sensitive Film
    Red-brown filter safe light
  13. Film Fog
    Undesirable increase of density of emulsion
  14. Intensifying Screen
    • 4 Layers
    • Protective coating, Phosphor, Reflective layer, Base
    • Higher speed of screen = more density less detail
    • Must contact entire film
  15. Resolution
    • Ability to consistantly produce image of an object
    • High speed = low resolution
  16. Chemical Processing
    • Change Latent Image (non-visible) held in film emulsion
    • Into Manifest Image we can see
  17. Film Processing
    • Develope
    • Fix
    • Wash
    • Dry
  18. Film Processing
    Developer
    Convert exposed silver halide into metallic silver
  19. Film Processing
    Fixer
    • Removes unexposed silver halide from emulsion
    • Hardens gelatin to make permanent record
  20. Film Processing
    Wash
    Removes fixer
  21. Film Processing
    Dry
    Prepares for viewing
  22. Developer Agents
    • Phenidone
    • Elon
    • Hydroquinone
  23. Silver Halide
    Electrical Charges
    • Unexposed = positive
    • Exposed = negative
    • Developer = negative
  24. Auto Processor
    • Transport
    • Water
    • Recirculation
    • Replenishment
    • Dryer
  25. Film Artifacts
    • Physical, Mechanical, Chemical
    • Brown stain = old developer
    • Multicolor = poor rinsing
    • Yellow = exhausted fixer
    • Reticulation = web-like = extreme diference in solutions
  26. Sensitometry
    • Study of how film responds to rads exposure and processing conditions
    • 3 Methods:
    • Step-wedge pentrometer and medium exposure
    • Sensitometer exposure
    • Pre-exposed strips

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