Which of the following are used to designate contaminated areas?

• A. Step off pads
• B. Postings
• C. Signs
• D. All of the above

Answer: (D)

Contaminated areas are marked using multiple cues that clearly define the boundary and help prevent the spread of contamination. Step-off pads are placed at the entry to a controlled or contaminated area to create a distinct point for removing footwear or outer garments before crossing the boundary, which reduces the chance of carrying contamination outside the area. Postings provide written notices that a region is controlled or contaminated and outline access restrictions, often including what regulates entry and who to contact. Signs deliver visible warnings and information at doors or along the boundary, using standard radiation symbols and clear instructions so workers and visitors know the hazard and required precautions. Using all of these together creates a reliable system: signs and postings communicate the presence and rules, while step-off pads provide a physical boundary and a process to minimize spread. All of these tools are used to designate contaminated areas.