Define hot, warm, and cold zones in a CBRN decon site and one key control measure for each.

• A. Hot zone (highest contamination) requires strict PPE and entry control points; Warm zone (transition) manages PPE doffing and decon of equipment; Cold zone (clean) holds personnel and cleared equipment; controls include entry/exit control points, flow management, and post-decon verification.
• B. Hot zone is the area with the least contamination; Warm zone has no decon; Cold zone stores artifacts.
• C. Hot zone is where PPE is stored; Warm zone is where meals are served; Cold zone houses vehicles.
• D. There are no zones; operations are identical throughout.

Answer: (A)

In a CBRN decontamination setup, zones are arranged to contain contamination and protect personnel as they move through the site. The hot zone contains the highest level of contamination, so the main control is strict PPE and entry/exit control to prevent spread and ensure only trained, properly equipped people enter. The warm zone serves as the transitional area where decontamination occurs and PPE is doffed; the key control here is the decontamination of equipment and the doffing process to remove contaminants before moving toward the clean area. The cold zone is the clean area where personnel and cleared equipment reside; the essential control is post-decon verification to confirm the area and individuals are free of contamination before continuing. This setup minimizes cross-contamination and maintains a safe flow of personnel and gear through the site.