Film Factors (7) Flashcards
1
Q
Different film have different characteristics, these include:
A
level of:
- contrast
- relative speed
- graininess
- latitude
2
Q
Consider these factors when selecting a film for the task:
A
- desired contrast and/or sensitivity
- types of discontinuities sought
- effects of scatter
- time to complete
3
Q
Proper film selection is based on:
A
- thickness
- material type
- energy range of source
4
Q
When should screens be used?
A
energies 150keV - 2MeV
5
Q
Exposure times can be reduced by ___ to ___ the original exposure time by using screens.
A
1/3 to 1 /2X
6
Q
Energies below 150keV should not use screens because:
A
they act only as a filter and diminish overall film quality
7
Q
When are backing screens used?
A
energies below 150keV
