Identify a situation that requires immediate reporting in nuclear gauge operations.

In nuclear gauge operations, any suspected radiation exposure incident represents a critical situation that necessitates immediate reporting. This is vital because radiation exposure can have serious health implications for personnel and the surrounding environment. Timely reporting allows for a rapid response to assess the extent of exposure, implement protective measures, and prevent further incidents. It also ensures compliance with regulatory requirements and safety protocols, highlighting the importance of prioritizing safety in environments where radioactive materials are used.

In contrast, regular maintenance checks, routine performance evaluations, and changing the batteries of the device are standard operational activities that do not pose immediate risks and are typically managed within normal operational procedures. These situations focus on ensuring equipment is functioning correctly and safely, rather than addressing emergencies or potential exposure incidents, which require immediate action and reporting.