What type of container is specified for transporting radioactive materials?

The correct choice, which specifies DOT Type 7A containers, relates to the transportation of radioactive materials in accordance with federal regulations. The Department of Transportation (DOT) has established specific packaging requirements for the safe transport of hazardous materials, including radioactive substances. Type 7A containers are specifically designed and tested to adhere to safety standards for the containment of radioactive materials during transport, providing necessary protection against leakage and ensuring safety.

The other options do not meet the rigorous requirements and standards set for transporting radioactive materials. Common plastic containers may not provide sufficient protection against radiation or physical damage. Glass containers, while strong, may still pose risks of breakage and are not classified specifically for radioactive materials transport. Metal containers, while they do provide strength and durability, are not the exclusive requirement and might lack the design and testing that a DOT Type 7A container undergoes to ensure the safe transport of radioactive materials. Thus, selecting the correct container type is crucial for compliance with safety regulations.