What type of package is used for large quantities of radioactive material?

The correct choice is Type B because it is specifically designed for the transportation of large quantities of radioactive materials that may pose a significant hazard during transport. Type B packages are built to withstand severe conditions, including strong impacts, fire, and water immersion, ensuring that the radioactive materials remain contained even in the event of an accident. This makes them essential for safely transporting materials that are more radioactive or involved in higher-risk operations.

Type A packages are used for smaller quantities of radioactive materials with lower risk profiles and less stringent safety requirements compared to Type B. On the other hand, Yellow II and Yellow III classifications refer to transport indexes that indicate the degree of radiation exposure at a specified distance, rather than types of packages for large quantities. Yellow II typically denotes a lower radiation level than Yellow III but does not imply the package design or containment capability that Type B offers for larger quantities.