Which of the following is listed as a source of radiation exposure in radiography?

• A. The tube head
• B. The computer monitor
• C. The chair
• D. The floor mat

Answer: (A)

Radiation exposure in radiography mainly comes from the X-ray tube itself, housed in the tube head. When the machine is energized, high voltage accelerates electrons that slam into the anode, producing X-rays that exit the tube to form the image. This tube head is the primary source of ionizing radiation involved in the procedure, and safety strategies target reducing exposure from this source through shielding, proper technique factors, and keeping distance. The computer monitor, by contrast, does not emit ionizing radiation in modern systems; it just displays the image. A chair or floor mat likewise does not generate X-rays, so they do not contribute to radiation exposure.