What should be done first after a suspected radiation incident?

In the event of a suspected radiation incident, the first step is to secure the area, assess exposure, and follow emergency protocols. This ensures that the safety of the personnel and the public is prioritized. By securing the area, you prevent unauthorized access and further contamination, which is crucial in managing the incident effectively. Assessing exposure allows responders to understand the risk levels involved, ensuring that appropriate protective measures are taken. Following established emergency protocols provides a structured approach to managing the situation, enabling responders to effectively mitigate hazards and implement safety measures.

The other options, while important, typically follow after the immediate safety of the area and individuals is ensured. For instance, notifying the public or conducting a media briefing is contingent upon a clear understanding of the incident's scope and the dangers present, which can only be established after securing the scene and evaluating any exposures. Similarly, disposal of contaminated materials can only take place once the area has been properly assessed and secured to avoid further contamination. Thus, the priority lies in ensuring safety and following proper emergency procedures.