Which factor would be detrimental to radiographic image sharpness?

A large film focal distance can significantly compromise radiographic image sharpness. In radiography, the focal distance refers to the distance between the radiation source (the x-ray tube) and the film or detector. When this distance is increased, the x-rays scatter more before reaching the film, leading to a decrease in image sharpness. This scattering effect can create a blurred image, as the rays are not as well-defined in their path to the film surface.

In contrast, high film contrast enhances the visibility of different densities on a radiograph, allowing for greater differentiation between structures. Increased exposure time typically allows more x-rays to reach the film, contributing to a denser image that can actually improve sharpness, as long as other variables are controlled. Similarly, higher film sensitivity can allow for clearer images with lower doses of radiation, maintaining or enhancing sharpness. Therefore, the factor that detracts from image sharpness is indeed a large film focal distance.