Which action is prohibited when entering a contaminated area?

Using personal tools without authorization in a contaminated area is prohibited because such tools may not meet the safety and contamination control standards required for those environments. Contaminated areas pose risks not only to the individual entering but also to the integrity of the area. Personal tools can easily become contaminated and further spread radioactive materials, compromising safety protocols and increasing the risk of exposure to radiation.

In contrast, actions like using issued tools from the Radiological Controlled Area (RCA) tool room are typically permitted because these tools are specifically designed, maintained, and monitored for use in contaminated environments. Regularly checking dosimeter readings is important for ensuring personnel are aware of their exposure levels, and wearing protective clothing is essential for safeguarding against contamination and exposure. Both of these actions reinforce safety practices rather than undermine them.