What do the signs "caution - radioactive materials" and "caution - authorized personnel only" indicate?

The signs "caution - radioactive materials" and "caution - authorized personnel only" serve a crucial role in radiation safety by informing individuals of potential hazards associated with radioactive materials and delineating access to those areas.

The warning about radioactive materials alerts individuals to the presence of ionizing radiation, which can pose health risks if proper protective measures are not observed. The "authorized personnel only" aspect establishes that only individuals trained and cleared to work in those environments are permitted entry. This restriction is essential for maintaining safety protocols, as it ensures that only those who understand the risks and the necessary safety measures can access potentially dangerous areas.

This signage is fundamental to creating a safe environment in areas where radioactive materials are present, as it educates personnel and the public about the necessary precautions while limiting exposure to hazardous conditions. In contrast, the other options address aspects that do not directly relate to the primary functions of these signs, such as waste disposal, training information, or alarm indications.