What general action should be taken if an individual is noted to have high levels of radiation exposure?

Providing immediate care and medical attention is essential when an individual is observed to have high levels of radiation exposure because such exposure can lead to acute radiation syndrome or other serious health complications. Immediate action is crucial to minimize further harm and address any potential medical issues resulting from the exposure.

This might include assessing the individual's symptoms, providing supportive care, and possibly administering treatments to mitigate the effects of radiation. Timely intervention by medical professionals can be life-saving and can prevent the progression of radiation-induced injuries, allowing for better health outcomes.

The other actions listed—restricting movement, conducting an investigation, and documenting exposure—are important and should be part of the overall response protocol, but the priority in an emergency situation is to ensure the health and safety of the individual affected.