When should decontamination corridor be established?

• A. After entry teams complete decon
• B. During neutralization
• C. Only after stabilization
• D. Before personnel begin working in the hot zone

Answer: (D)

The decontamination corridor is placed before anyone starts working in the contaminated area to create a controlled transition between the hot zone and the rest of the incident site. This setup ensures there is a defined path for entry and, just as importantly, for exiting the hot zone so contaminants aren’t carried into cleaner areas. By having the corridor ready beforehand, responders can perform decontamination steps—such as initial wash, PPE doffing, and runoff containment—without delay and with proper access control. This prevents cross-contamination, protects other personnel, and keeps the cold zone from becoming contaminated.

Waiting to establish it later would mean responders enter the hot zone without a prepared, contained route for decon, increasing the risk of spreading contamination. Setting it up during neutralization or only after stabilization would also delay essential decontamination processes and still fail to prevent contamination spread.