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Flashcards in Film Development Deck (31):
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

single film exposure =
continual glow =

fluoresce (single)
luminesce (glow)

31

color of emitted light must match light sensitivity of film

spectral matching