What must be established to prevent unauthorized access to contaminated areas?

Establishing barriers and signage is crucial for preventing unauthorized access to contaminated areas. This approach effectively communicates risks and hazards to individuals who may unintentionally enter these zones. Barriers, such as physical fences or gates, act as a tangible obstruction, immediately signaling that the area is restricted. Signage serves an educational purpose, warning of the dangers present and informing all personnel and visitors that special protective measures or equipment may be necessary.

Utilizing training programs can prepare personnel on how to handle hazardous materials and navigate around contaminated sites, but these measures do not inherently prevent access. Emergency drills, while essential for ensuring readiness in responding to incidents, do not directly restrict entry to contaminated areas. Regular monitoring is important for assessing ongoing conditions and ensuring safety; however, it also does not provide a physical barrier or warning system to limit access. Therefore, the combination of barriers and signage is the most effective immediate strategy to ensure unauthorized individuals do not enter hazardous zones.