Which DOT hazard class is associated with radioactivity?

• A. Class 7: Radioactive
• B. Class 3: Flammable liquids
• C. Class 4: Flammable solids
• D. Class 9: Miscellaneous

Answer: (A)

Radioactivity is handled in transportation by designating a specific hazard class for radioactive materials. This is Class 7. That classification exists because radioactive materials must be managed with strict controls to limit radiation exposure and prevent contamination during shipping. Requirements include special packaging that contains the material safely, labeling with the radiation symbol and the class designation, and the use of appropriate shielding, monitoring, and handling procedures. Because only this class covers radioactive materials, it is the best answer. The other options describe different hazards—flammable liquids (which ignite easily), flammable solids (which can burn or ignite under certain conditions), and miscellaneous materials (which don’t fit other categories)—and none of those are about radiation.