What is a significant source of man-made radiation exposure?

Medical imaging procedures are recognized as a significant source of man-made radiation exposure because they involve the use of ionizing radiation to obtain diagnostic images of the body. Common imaging techniques such as X-rays, CT scans, and fluoroscopy are widely used in healthcare settings to diagnose and monitor various medical conditions. The implementation of these procedures allows for better treatment planning and improved patient outcomes, but they do contribute to the overall radiation dose a person may receive over their lifetime.

In contrast, cosmic rays and natural background radiation are forms of natural radiation that occur regardless of human activity and are not considered man-made sources. Radon gas, while a significant contributor to natural radiation exposure in homes, is also not classified as man-made. Thus, medical imaging stands out as the primary man-made source of radiation exposure in this context.