What type of sign is required at the entrance to a nuclear gauge storage area?

A Caution - Radioactive Materials Sign is required at the entrance to a nuclear gauge storage area to alert individuals of the potential hazards associated with radioactive materials. This sign serves to inform personnel and visitors that they are entering an area where radioactive substances are stored, which may pose health risks if proper safety protocols are not followed.

The presence of this sign emphasizes the importance of awareness and caution when dealing with radioactive materials, as it is crucial to minimize exposure to radiation and ensure the safety of all individuals in proximity to the storage area. By delineating the area clearly with appropriate warnings, it helps to prevent accidental access and ensures that only individuals who are trained and equipped to handle such materials enter the location.

In contrast, while signs like "Private Property" or "No Trespassing" can indicate restricted access, they do not specifically convey the nature of the hazard present. Additionally, "Authorized Personnel Only" is important for managing access but does not communicate the specific risk associated with radioactive materials, which is the primary concern in this scenario. Thus, the Caution - Radioactive Materials Sign is the most appropriate to ensure safety and compliance in a nuclear gauge storage context.