Which of the following is a step in responding to a radiological accident (SWIMS)?

• A. Stop the spill
• B. Calibrate all equipment daily
• C. Evacuate to a distant area with no decontamination
• D. Initiate a search and rescue operation

Answer: (A)

The main idea is to immediately limit radiation exposure by stopping the source of contamination. In a radiological incident, the fastest and most impactful action is to halt the release at its origin. By stopping the spill, you directly reduce further exposure to people, prevent the spread of contamination to surfaces, air, and long-range areas, and buy crucial time to set up protective measures and decontamination. That foundational step makes it possible to carry out subsequent actions—like decontamination, controlled evacuation or sheltering, and information outreach—more safely and effectively.

Calibrating equipment daily isn’t an emergency action but routine maintenance, so it doesn’t address the immediate threat. Evacuating to a distant area with no decontamination would simply move people into a contaminated environment and spread contamination, rather than solving the problem. Initiating a search and rescue operation could put responders at risk and distract from containing the source when radiation is still being released. Stopping the spill directly mitigates the hazard at its source, which is why it’s the best first response.