Alabama Fire College HAZMAT Technician Practice Test

Radioactive materials are identified by the placard that features the radiation trefoil symbol. This placard is the transport hazard class designated for radioactivity, signaling the need for shielding, distance, time controls, and other radiological precautions. The other options correspond to different hazards—toxic substances, flammable liquids, and corrosives—so they do not indicate radioactivity. Look for the radiation symbol to know you’re dealing with radioactive materials.