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Radiation Physics > Film Development > Flashcards

Flashcards in Film Development Deck (31)
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1
Q

exit x-ray beam aka

A

remnant beam

2
Q

film coat

A

double emulsion or screen film

3
Q

emulsion

A

image formed here

4
Q

film layers

A

base –> adhesive –> emulsion –> supercoat

5
Q

made of polyester

A

film base

6
Q

film base provides

A

stability

7
Q

gelatin + silver halide crystals (SHC) =

A

emulsion

8
Q

SHC =

A

98 % silver bromide + 2% silver iodide

9
Q

x-rays/light interact with SHC –>

A

latent image

10
Q

part of emulsion contaminated by silver sulfide

A

sensitivity center or “speck”

11
Q

speck produces the

A

latent image

12
Q

modern SHC are

A

tabular in shape

13
Q

larger crystals

A

develop fast with lower contrast

14
Q

energy to dislodge other electrons

A

secondary electron

15
Q

invisible until developed

A

latent image

16
Q

widely used within image receptor

A

screen-film

17
Q

dentistry

A

direct films

18
Q

size and distribution of SHC

A

contrast

19
Q

light crosses base and exposes opposite emulsion

A

crossover exposure

20
Q

automatic processing sequence

A

develop –> fix –> wash –> dry

21
Q

Ag+ is reduced to metallic silver

A

developing

22
Q

developing agent

A

hydroquinone and phenidone

reducing agents

23
Q

exposed/reduced part of latent image

A

sensitivity centre

24
Q

ensures archival quality

A

fixing

25
Q

sodium thiosulfate

A

hypo

26
Q

added to neutralize the emulsion pH

A

acetic acid (activator)

27
Q

remove fixer with water

A

washing

- 3 deg C or 5 F

28
Q

used in the cassete to produce more light

A

intensifying screen (.4 mm)

29
Q

intensifying screens decrease

A

mAs required thus decrease dose

30
Q

single film exposure =

continual glow =

A

fluoresce (single)

luminesce (glow)

31
Q

color of emitted light must match light sensitivity of film

A

spectral matching