The optical density of gross fog is:
Correct Answer: 0.2-0.3
Description: An unexposed film, when processed, shows some density. This appearance is caused by the inherent density of the base and added tint and the development of a few unexposed silver halide crystals. This minimal density is called base plus fog and typically is 0.2 to 0.3.
White and Pharoah's Oral Radiology Principles and Interpretation 8th edition
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Radiology
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