Which of the following is a critical first step in handling a radiation exposure incident?

Assessing exposure levels is a fundamental first step in handling a radiation exposure incident because it provides critical information about the extent of exposure to individuals and the environment. This assessment helps determine the appropriate response measures and establishes whether immediate medical attention or decontamination procedures are necessary. Understanding the levels of radiation involved ensures that responders can act appropriately while minimizing risks to themselves and others.

In an exposure scenario, knowing the precise levels of radiation allows for informed decision-making regarding evacuation, area cordoning, and the need for protective equipment. This assessment can guide subsequent actions and prioritizations in managing the incident effectively. Hence, evaluating exposure levels is vital for both safety and response planning in radiation incidents.