Which posting describes a radiological hazard?

• A. Postings with yellow background and tri-foil symbol
• B. Postings with blue background and circle symbol
• C. Postings with red background and a no symbol
• D. Postings with green background and leaf symbol

Answer: (A)

Radiological hazard signs are the bright yellow warning signs with the radiation symbol. The yellow backdrop grabs attention, and the three-bladed (trefoil) symbol is the internationally recognized mark for ionizing radiation. Together, they instantly signal a real risk of radiation exposure and prompt people to follow safety controls, limit exposure, and use appropriate shielding or PPE. The other color-and-symbol combinations point to different safety messages—blue with a circle means a required action, red with a prohibition marks something not allowed, and green with a leaf conveys safety information—none of which indicate radiation risk. So the posting that describes a radiological hazard is the one with a yellow background and the tri-foil radiation symbol.