Which item would most likely be used for transporting low radioactivity materials?

The choice of using steel, wood, or fiberboard packaging for transporting low radioactivity materials is considered the most appropriate due to the robustness and durability of these materials. This type of packaging provides sufficient protection against physical damage during transportation, which is critical for maintaining safety and containment.

Steel containers, for instance, are particularly effective at shielding against radiation, while wood and fiberboard can also serve as suitable alternatives for lighter applications. The materials are designed to meet regulatory standards for transporting hazardous materials, ensuring that the radioactive materials are securely contained and that there is minimal risk of exposure to personnel or the environment.

Other options, while they may have their uses, do not provide the same level of safety and structural integrity for the specific needs of transporting low radioactivity materials. For example, cardboard boxes might not offer sufficient protection or radiation shielding, while refrigerated containers are more suited for temperature-sensitive cargo rather than radioactive materials. Plastic wrap may be useful for protecting surfaces or securing items but lacks the structural properties needed for safely transporting hazardous materials.