Final answer:
The other Hazard Class for a material that is both Radioactive and hazardous in another way is referred to as subsidiary, indicating it is a secondary risk that must also be managed.
Step-by-step explanation:
For a material that meets the definition of Radioactive Material, and also meets the definitions of another Hazard Class, the other Hazard Class is referred to as subsidiary. This is because when a material is hazardous in more than one way, one of the hazards is classified as the primary or main risk, while the other is considered a subsidiary or secondary risk according to regulations set for the transport and handling of dangerous goods. Radioactive materials that are also hazardous in other ways are a good example of this classification method, since they present multiple risks that must be managed properly.