Which term correctly describes an item that is mounted on a viewer following processing?

The term that correctly describes an item mounted on a viewer following processing is "radiograph." A radiograph is the image produced on a photosensitive surface, such as X-ray film, after the exposure and subsequent developing processes. It becomes a visible image that can be viewed on a lighted surface or viewer. This term encompasses the final processed image used in diagnostics and treatment planning by dental professionals.

While film and X-ray film refer to the material that captures the image, they do not specify the processed image itself. The film packet typically refers to the entire packaging that contains the film before exposure, and it is not the final product viewed. Therefore, radiograph is the specific term that accurately denotes the processed item ready for evaluation.