Radiology Practice Test

What does the grain size/crystals on a film do to the speed?

1. The fastest films have the smallest grains

2. The fastest films have the largest grains

3. The fastest films have medium-sized grains

4. The grain size does not affect speed

The correct answer is: The fastest films have the largest grains

The grain size/crystals on a film directly affect its speed. The larger the grains, the faster the film will be. So Option B is the correct answer. Option A is incorrect because the size of the grains and the speed are inversely related. Option C is also incorrect because the term "medium-sized" is ambiguous and does not give a definitive answer about the relationship between grain size and speed. Option D is incorrect because, as previously mentioned, grain size does play a role in the speed of a film.