Final answer:
Gamma radiation is the type that exits the patient and exposes the film or IP.
Step-by-step explanation:
Of the 3 radiation types, gamma radiation is the one that exits the patient and exposes the film or IP. Gamma rays are a type of electromagnetic radiation with high energy and short wavelength. They have the ability to penetrate matter easily, including the patient's body, and reach the film or Image Plate (IP).