Final answer:
During a fluoroscopic exam, the main source of scattered radiation is produced from the patient themselves. Hence, option 4 is correct.
Step-by-step explanation:
In a fluoroscopic exam, the main source of scattered radiation is produced from the patient themselves.
During the exam, x-rays are directed towards the patient's body. Some of these x-rays are absorbed by the patient and some are scattered. The scattered x-rays can then reach the detector, causing image degradation and increasing the radiation exposure for the patient and the medical staff.
To minimize the scattered radiation, lead shielding can be used, and the x-ray beam can be collimated to only cover the necessary area.