Backscatter radiation can have a significant effect on the quality
of a radiograph. Backscatter radiation is radiation that is scattered
from an object on the film side of the specimen. This exercise can be
used to develop an appreciation for just how significantly backscatter
radiation can affect radiograph quality.
- Load a film cassette that does not have lead foil screens built-in
with a piece of film.
- Place a lead letter "B" on the back side of the cassette.
- Locate a piece of aluminum plate or similar material of uniform
thickness and place it on the film for the exposure.
- Place a piece of corrugated cardboard on the backside of the film.
- Expose the film to produce a density of 2.0 to 3.0.
- Process the film
- Evaluate the film to determine if the letter "B" and
features of the cardboard are visible.