American Society for Nondestructive Testing (ASNT) Radiographic Testing Practice Test

The term that indicates the size of the smallest detail visible in a radiograph is commonly referred to as radiographic sensitivity. Radiographic sensitivity pertains to the ability of the radiographic system to detect and show small features or defects within the tested material. A system with high sensitivity can reveal finer details, allowing for the identification of small imperfections, which is critical in ensuring material integrity and safety in various applications.

While the other terms are related to radiographic testing, they do not specifically define the smallest detail visible. Image resolution refers to the overall clarity and sharpness of the image but does not directly quantify the size of the smallest detail. Detail visibility might convey a similar concept but lacks the precision associated with sensitivity. The contrast ratio relates to the strength of black-and-white differences in the radiograph, affecting the visibility of features but not indicating the physical size of the elements being viewed. Thus, radiographic sensitivity is the most accurate term to describe the capability of detecting small details.