The term used for scattered radiation that exits the patient and exposes the film is:

The term "remnant radiation" refers to the radiation that exits the patient after interacting with the tissues during a radiographic procedure. This is the radiation that remains after the primary radiation has passed through the body and has been attenuated by the patient’s tissue. Remnant radiation includes both the primary beam that has passed through without being absorbed and any scattered radiation that may also exit the patient and contribute to the image on the film.

In radiography, understanding remnant radiation is crucial because it affects the quality and contrast of the images produced. The exposure on the film from remnant radiation is what ultimately creates the diagnostic image, allowing the radiologist to interpret the results.

Primary radiation refers to the beam of radiation generated by the X-ray tube before it interacts with the patient, while secondary radiation is radiation that occurs as a result of interactions within the body but is not necessarily what exits the patient. Background radiation, on the other hand, is the radiation present in the environment and does not relate specifically to the procedure being performed. This context helps clarify the importance and definition of remnant radiation in the realm of image production and evaluation.