Film (2,3) Flashcards

1
Q

Class depends on?

A
  • film speed
  • size of silver bromide and silver chloride grains
  • contrast
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2
Q

Contrast

A

Films ability to show density differences

- (high or low)

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3
Q

Classes

A

Type I

  • Type II
  • Type III
  • Type IV
  • Speed is slowest at Type I
  • Grain is finest at Type I
  • Contrast is highest at Type I
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4
Q

What are radiographic films made of?

A

An emulsion of gelatin and radiation sensitive silver halide crystals (silver bromide or silver chloride) that coat both sides of the base and layers about 0.0005in thick.

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5
Q

X-Ray Films are sensitive to what?

A

Light

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6
Q

What happens when developing Radiographic Film?

A

Ionization disturbs the atomic structure silver bromide in the film causing atoms to enter chemical reactions with one-another producing an image.

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7
Q

Lead Screens

A

Scattered Photons create a loss of contrast and definition. Exposures above 150Kv place the film between two thin sheets of lead foil screens.

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8
Q

Lead Foil Screens

A
  • Two thin sheets of lead compound evenly coated on a paper backing - essential in radiographic and gamma ray film
  • increase the films “photographic action”
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9
Q

What does Lead do to film?

A
  • Lead emits electrons and secondary radiation under the action of X/Gamma rays
  • shorter exposure time
  • Absorb large portion of scattered radiation intensifying primary radiation (contrast + definition)
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10
Q

Fluorescent Screens

A

Incident radiation causes these screens to give off light to help expose film

  • light produced is in all directions = lower definition
  • medical radiography, low Kv
  • NOT FOR GAMMA RAYS (RULE)
  • Thick specimens
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