What is a crucial safety measure when storing radioactive materials?

Proper labeling and secure containment of radioactive materials is vital for several reasons. Labeling ensures that anyone who comes into contact with the materials can quickly identify their hazardous nature and understand the associated risks. This helps prevent accidental exposure and promotes safety in handling.

Secure containment is equally important as it provides physical barriers that prevent unauthorized access and minimizes the risk of accidental release into the environment. By using proper storage containers that are compatible with the type of radioactive material, the integrity of the materials is maintained, reducing the potential for contamination or exposure.

In conjunction with proper labeling and secure containment, the other measures mentioned—such as regular inventory checks, limiting access to trained personnel, and storing away from flammable materials—are important for overall radiation safety but do not specifically address the immediate risks associated with the handling and storage of radioactive materials. Thus, while they contribute to a safe environment, they do not encompass the core aspects of safety that labeling and secure containment achieve directly.