Which class is associated with radiological hazards?

• A. Class 3
• B. Class 5
• C. Class 7
• D. Class 9

Answer: (C)

Radiological hazards are categorized as Class 7 in the hazardous materials classification system. This means any incident involving radioactive materials or radiation sources is treated specifically as Class 7, guiding responders to apply radiation-focused procedures from the outset. That includes using radiation detection equipment, establishing controlled zones, and following time-distance-shielding principles to minimize exposure, as well as coordinating with radiation safety experts for containment and decontamination. The other classes cover different hazards—flammable liquids, oxidizers/organic peroxides, or mixed/different dangerous goods—so they do not indicate a radiological risk and would lead to different protective actions. In short, incidents involving radioactive materials are identified by Class 7.