Which of the following situations requires a controlled area designation?

A controlled area designation is essential in environments where radiation activities occur, as these areas must be carefully monitored to ensure the safety and protection of personnel and the public. Controlled areas are specifically defined and regulated to limit access to trained personnel who can take appropriate safety measures when working with or near radioactive materials or equipment.

In workspaces with radiation activities, it's crucial to have established procedures, signage, and barriers to manage radiation exposure. This ensures not only compliance with safety regulations but also helps to maintain a safe working environment by restricting entry to authorized personnel who have undergone the necessary training to handle potential hazards effectively.

In contrast, standard office environments, storage rooms for office supplies, and public waiting areas do not involve any radiation-related activities or hazards, which is why they do not require controlled area designations. These areas typically do not have the same safety risks associated with radiation as those involved in radiation handling or exposure.