Under UN labeling, which hazard class would be cited for materials that spontaneously emit ionizing radiation?

Under UN labeling, which hazard class would be cited for materials that spontaneously emit ionizing radiation?

• A. Class 3
• B. Class 7
• C. Class 6
• D. Class 8

Answer: (B)

Radioactivity defines this hazard. Materials that spontaneously emit ionizing radiation are radioactive, so they fall into the radioactive materials category, known as Class 7 in UN labeling. This is different from the other hazards listed—flammable liquids, toxic substances, and corrosives—which correspond to Class 3, Class 6, and Class 8, respectively. So the appropriate designation for materials that emit ionizing radiation is the radioactive materials category.

Radioactivity defines this hazard. Materials that spontaneously emit ionizing radiation are radioactive, so they fall into the radioactive materials category, known as Class 7 in UN labeling. This is different from the other hazards listed—flammable liquids, toxic substances, and corrosives—which correspond to Class 3, Class 6, and Class 8, respectively. So the appropriate designation for materials that emit ionizing radiation is the radioactive materials category.