Which of the following describes the latent image on radiographic film?

The latent image on radiographic film is formed as a result of the film being exposed to radiation, which causes changes in the film's emulsion layer. During this exposure, silver halide crystals in the film are altered, creating a pattern of exposure that is not immediately visible. This characteristic makes option C the correct answer.

After exposure, the film requires processing (development, fixing, and washing) to reveal the latent image, converting it into a visible one. Therefore, while the image is indeed created upon exposure to radiation, it does not become visible until processing occurs, which makes option B inaccurate in describing the latent image itself.

The latent image is not visible under white light, as suggested by option A. It only becomes visible once the film has been chemically processed, which distinguishes it from the visible image produced after development.

Finally, the idea that the latent image is permanent and cannot change, as stated in option D, is incorrect. The latent image can be influenced if the film is improperly stored, subjected to light exposure, or inadequately processed, indicating that it is not indefinitely stable. Thus, option C clearly articulates the precise nature of the latent image's creation and is the most accurate choice.