Final answer:
To minimize exposure to radiation during a fluoroscopy exam, one should stand behind a lead shield.
Step-by-step explanation:
When performing a fluoroscopy exam, the correct position to stand for safety is b. Behind a lead shield. This is because a lead shield provides protection from ionizing radiation used in fluoroscopy by absorbing scattered X-rays, thereby reducing the exposure to the technician or radiologist. Figure 32.7 demonstrates that shielding and increased distance from the X-ray source are key factors in reducing radiation dose, along with the use of fast films to decrease exposure time. Standing as close as possible to the patient increases exposure risks, while standing at a 90-degree or 45-degree angle to the primary beam does not necessarily offer the best protection without additional shielding.