Which hazard classification is assigned to radioactive materials?

• A. 7
• B. 3
• C. 1
• D. 9

Answer: (A)

In hazmat transport, hazards are grouped into classes so responders know the exact type of danger and how to handle it. Radioactivity poses unique external and internal exposure risks that require specialized containment, shielding, and monitoring, so it has its own class. The hazard classification assigned to radioactive materials is Class 7. This separation ensures packaging, labeling, and transport rules address radiological risks specifically, including appropriate warning symbols and documentation. For comparison, explosives are Class 1, flammable liquids are Class 3, and toxic substances are Class 6, but radioactive materials belong to Class 7 to reflect their distinct hazards.