What is the first action to take according to the SWIMN procedure?

The SWIMN procedure is a key protocol designed to ensure safety during radiological incidents, particularly spills or releases of radioactive materials. The first action to take in such situations is to stop the spill. This step is critical because it prevents further dissemination of radioactive materials, which can pose a serious risk to both personnel and the environment. Taking immediate action to contain the spill minimizes exposure and allows for more controlled management of the incident.

Once the source of the spill has been addressed, additional measures, such as isolating the area and notifying Radiation Control (RadCon), can then be undertaken to secure the environment and implement cleanup operations. Starting with stopping the spill is fundamental to safeguarding health and ensuring a systematic response to the radiological hazard.