Flashcards in Film Development Deck (31)
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1
exit x-ray beam aka
remnant beam
2
film coat
double emulsion or screen film
3
emulsion
image formed here
4
film layers
base --> adhesive --> emulsion --> supercoat
5
made of polyester
film base
6
film base provides
stability
7
gelatin + silver halide crystals (SHC) =
emulsion
8
SHC =
98 % silver bromide + 2% silver iodide
9
x-rays/light interact with SHC -->
latent image
10
part of emulsion contaminated by silver sulfide
sensitivity center or "speck"
11
speck produces the
latent image
12
modern SHC are
tabular in shape
13
larger crystals
develop fast with lower contrast
14
energy to dislodge other electrons
secondary electron
15
invisible until developed
latent image
16
widely used within image receptor
screen-film
17
dentistry
direct films
18
size and distribution of SHC
contrast
19
light crosses base and exposes opposite emulsion
crossover exposure
20
automatic processing sequence
develop --> fix --> wash --> dry
21
Ag+ is reduced to metallic silver
developing
22
developing agent
hydroquinone and phenidone
(reducing agents)
23
exposed/reduced part of latent image
sensitivity centre
24
ensures archival quality
fixing
25
sodium thiosulfate
hypo
26
added to neutralize the emulsion pH
acetic acid (activator)
27
remove fixer with water
washing
- 3 deg C or 5 F
28
used in the cassete to produce more light
intensifying screen (.4 mm)
29
intensifying screens decrease
mAs required thus decrease dose
30
