After a radiation exposure incident, what is the most appropriate first step?

• A. Evacuate the building
• B. Turn off the X-ray system immediately
• C. Report the exposure to the radiation protection office
• D. Seek medical care for all exposed individuals

Answer: (B)

Stopping the radiation source right away is essential because it halts ongoing radiation emission, immediately reducing further exposure to anyone nearby. Turning off the X-ray generator thus minimizes the dose the people in the area would receive, which is the highest priority in an exposure incident. Once the source is secured, follow the established procedures to document the event and involve the radiation protection office, and arrange medical evaluation for exposed individuals as needed. Evacuating the building and seeking medical care are important steps, but they come after the immediate action of stopping the exposure, since continuing irradiation would make medical assessment less meaningful and complicate dose management.