Imaging unit 6

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Author:
ashleyfoster
ID:
184426
Filename:
Imaging unit 6
Updated:
2012-11-20 12:03:32
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Film processing AEC
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Imaging unit 6-film processing and AEC
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  1. What is the primary purpose of film processing?
    • To deposit enough black metallic silver at the latent image sites in film to permit a permanent visible image to form. ¬†
    • (to accumulate enough black metallic silver at the sensitivity spects to yield a visible image)
  2. What ar the four steps of film processing?
    • Developing
    • Fixing
    • Washing
    • Drying
  3. ________ and __________ are accomplished in solutions that combine numerous chemicals.
    Developing and fixing
  4. ________ involves a two-step process of washing and drying the radiograph for use as a medical record.
    Archiving
  5. What happens in the developing process?
    Silver is deposited at the latent image sites and an image becomes visible.
  6. What does developing consist of? (6parts)
    • Reducing agents(primary agent)
    • Activator
    • Restrainer
    • Preservative
    • Hardener
    • Solvent
  7. The action of the developer is controlled by ________, _________, and ___________.
    • Immersion time
    • solution temperature
    • chemical activity
  8. What is the chemical and function of the reducing agent?
    • Phenidone and hydroquinone
    • Phenidone(P developer)-rapidly produces fine detail shades of gray
    • hydroquinone(Q developer)-slowly produces heavy densities
  9. How long is the developer in the 90 second processor and what is its function?
    • 20-25 sec
    • reduces latent image to visible black metallic silver
  10. What is the chemical and function of the activator in the developer?
    • Sodium carbonate
    • produces alkaline pH,swells gelatin
  11. What is the chemical and function of the restrainer in the developer?
    • Potassium bromide
    • decreases reducing agent activity, antifogging agent
  12. What is the chemical and function of the preservative in the developer?
    • Sodium sulfite
    • controls oxidation, buffer agent
  13. What is the chemical and function of the hardener in the developer?
    • Glutaraldehyde
    • hsrdens emulsion, reduces gelatin swelling
  14. What is the chemical and function of the solvent in the developer?
    • Water
    • disolves chemicals
  15. How long is the fixer in the 90 second processor and what is its function?
    • 20 sec
    • stops reduction and removes undeveloped silver halides from emulsion.
  16. What is the chemical and function of the clearing agent of the fixer?
    • Ammonium thiosulfate
    • removes undeveloped silver halides from emulsion.
  17. What is the chemical and function of the activator of the fixer?
    • Acetic acid
    • provides acidic pH, stops reduction
  18. What is the chemical and function of the hardener in the fixer?
    • Potassium alum
    • hardens emulsion
  19. What is the chemical and function of the preservative in the fixer?
    • Sodium sulfite
    • maintains pH
  20. What is the chemical and function of the solvent in the fixer?
    • Water
    • disolves chemicals
  21. How long is the wash in the 90 second processor and what is its function?
    • 20 sec
    • removes developing and fixing chemicals
  22. What is the chemical and function of the solvent in the wash?
    • Water
    • removes excess chemicals
  23. How long does the dry take in the 90 second processor and what is its function?
    • 25-30 sec
    • removes water and seals emulsion¬†
  24. What is the function of the hot air in the dryer?
    Evaporates water and hardens emulsion.

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