X-ray Film

Question 1

Construction of film

Answer 1

Sheet of cellulose acetate covered by layer of emulsion
Layer of clear gelatine protects emulsion and binds it to acetate
Emulsion contains silver halide granules (silver bromide)

Question 2

How do x-rays affect silver halide granules

Answer 2

Cause chemical reaction in granules

Reactions decreases with higher tissue density

Question 3

Define latent image

Answer 3

Exposed but not processed

Question 4

Define screen film

Answer 4

Must be used in cassette with intensifying screens
Film speed increases with granule size
Increased speed leads to short exposure and development times
- Loss of definition

Question 5

Define non-screen film

Answer 5

Contained in light-tight envelopes
Used for higher definition where cassette impractical (dental)
Require longer exposure and development time

Question 6

Define film-screen speed

Answer 6

Relates to exposure req. for given degree of blackening

Question 7

What can be a result of poor film-screen contact

Answer 7

Image blurring

Question 8

What should labelling be and include

Answer 8

Permanent

ID name +/- number
Date
R/L marker

Question 9

Labelling req. for hip dysplasia scheme

Answer 9

Must be done prior to processing

KC reg. number
- alternative ID if not registered
Microchip no.
Date
R/L marker

Question 10

Labelling prior to exposure methods (2)
Labelling in darkroom method (1)
Labelling post-processing (1)

Answer 10

Graphite tape
Lead letters

Light marker prior to processing on unexposed corner

White chinagraph pencil