What is a plot of film density versus log of relative exposure commonly called?

The plot of film density versus the logarithm of relative exposure is commonly referred to as the characteristic curve. This graphical representation is essential in radiographic testing as it illustrates the relationship between the exposure of the film and the resulting density obtained after development.

The characteristic curve is important because it helps radiographers understand the film’s sensitivity to exposure and how effectively the film will capture the variations in density that correlate with the thickness and types of materials being radiographed. It allows for the assessment of film performance under different exposure conditions, thus guiding the selection of appropriate exposure settings for optimal radiographic quality.

Understanding the correct terminology and concepts associated with radiographic processes enhances the ability to analyze and interpret results in tests and examinations. The characteristic curve is a fundamental concept in radiography, establishing it as the preferred term in the context of this question.