The Original Locking Container for Radioactive Materials Rad-Lock Box containers increase security for storage of radioactive materials in the laboratory. Constructed of thick heavy duty acrylic with a built-in cylinder key lock and tamper resistant hinges. Rad-Lock Box containers limit and control access to only authorized individuals. Convenient for storing, handling and transporting assorted small bottles, vials and tubes. The large interior can be filled with crushed ice to keep samples cold. Safe for storage in a freezer to -70?C.