A substance that spontaneously releases ionizing radiation is classified under which hazard category in the UN Labeling System?

• A. 3
• B. 7
• C. 9
• D. 1

Answer: (B)

A substance that spontaneously releases ionizing radiation is classified under the hazard category labeled as radioactive materials. In the UN Labeling System, this is represented by the number 7. This category specifically pertains to dangerous goods that emit radiation, indicating a potential risk to health and safety due to their radioactive nature.

The classification helps ensure that anyone handling or transporting such materials is aware of the necessary precautions and safety measures to mitigate the risks associated with exposure to radiation. Understanding this classification is essential for compliance with safety regulations and for the protection of personnel, the public, and the environment.