What can clue you in on the degree of radiation hazard at a building-based emergency scene?

• A. Color of the walls
• B. Signage on the building
• C. Number of personnel
• D. PPE type

Answer: (B)

The main cue for the level of radiation hazard at a building-based emergency scene is the signage posted on the building. Official signs and placards communicate that radiation is present, indicate restricted or controlled areas, and often point to required precautions, giving responders a rapid, standardized read on the hazard without needing to measure it themselves. The other options aren’t reliable indicators: wall color isn’t standardized to hazard levels, the number of people there doesn’t reveal how dangerous the radiation is, and while the protective equipment used matters for safety, it reflects response decisions rather than the actual degree of hazard.