The Problem with Under Exposure

Question 1

Relative Exposure

Answer 1

Radiographs are assessed according to the film density

Extra:
Relative exposure is the ratio of two exposure

Question 2

The rules for mAs and voltage for density of the film

Answer 2

50% rule; doubling the mAs doubles the density of the film (either 2X the mA or time

15% rule; 15% increase in kVp will 2x the density of the film