Film Development Flashcards by Thomas Etue

Q

exit x-ray beam aka

A

remnant beam

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Q

film coat

A

double emulsion or screen film

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Q

emulsion

A

image formed here

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Q

film layers

A

base –> adhesive –> emulsion –> supercoat

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Q

made of polyester

A

film base

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Q

film base provides

A

stability

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Q

gelatin + silver halide crystals (SHC) =

A

emulsion

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Q

SHC =

A

98 % silver bromide + 2% silver iodide

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Q

x-rays/light interact with SHC –>

A

latent image

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Q

part of emulsion contaminated by silver sulfide

A

sensitivity center or “speck”

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Q

speck produces the

A

latent image

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Q

modern SHC are

A

tabular in shape

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Q

larger crystals

A

develop fast with lower contrast

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Q

energy to dislodge other electrons

A

secondary electron

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Q

invisible until developed

A

latent image

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Q

widely used within image receptor

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A

screen-film

Q

dentistry

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A

direct films

Q

size and distribution of SHC

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A

contrast

Q

light crosses base and exposes opposite emulsion

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A

crossover exposure

Q

automatic processing sequence

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A

develop –> fix –> wash –> dry

Q

Ag+ is reduced to metallic silver

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A

developing

Q

developing agent

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A

hydroquinone and phenidone

reducing agents

Q

exposed/reduced part of latent image

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A

sensitivity centre

Q

ensures archival quality

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A

fixing

sodium thiosulfate

hypo

added to neutralize the emulsion pH

acetic acid (activator)

remove fixer with water

washing | - 3 deg C or 5 F

used in the cassete to produce more light

intensifying screen (.4 mm)

intensifying screens decrease

mAs required thus decrease dose

single film exposure = | continual glow =

fluoresce (single) | luminesce (glow)

color of emitted light must match light sensitivity of film

spectral matching