Which hazard label would be used for a substance that emits dangerous radiation?

• A. Spontaneously Combustible
• B. Radioactive substance
• C. Non-flammable compressed gas
• D. Explosive

Answer: (B)

When a substance emits dangerous radiation, the label must clearly signal that it is radioactive. This communicates an ionising radiation risk and prompts specific safety measures: minimize exposure time, maximize distance, use shielding, and handle with proper containment and monitoring. The other options describe hazards unrelated to radiation—spontaneously combustible means it can ignite on contact with air or moisture, non-flammable compressed gas refers to gases stored under pressure that do not burn, and explosive indicates a substance that can detonate or rapidly release energy. None of those warn about radiation, so they aren’t appropriate for a radioactive substance.