Which of the following helps prevent the spread of contamination?

Monitoring personnel before they exit the area is crucial in preventing the spread of contamination for several reasons. This practice involves checking individuals for radioactive particles or materials that may be clinging to their clothing or skin after they have been working in contaminated environments. By conducting these checks, any contamination can be identified and addressed before staff members leave the controlled area, thereby reducing the risk of spreading radioactive materials to clean areas or to the outside environment.

In contrast, increasing the volume of waste does not inherently prevent contamination; it might even complicate waste management processes. Minimizing personal protective equipment (PPE) use increases the risk of exposure to hazardous materials and does not align with safety protocols meant to protect individuals. Enhancing ventilation systems, while beneficial for dispersing airborne contaminants, does not directly monitor or contain contamination at the source, which is why the monitoring of personnel is the most effective immediate measure in this context.