What is the primary difference between normal form and special form containers?

The primary difference between normal form and special form containers relates to the safety and handling of radioactive materials. Special form containers are designed specifically to minimize radiation exposure and prevent the release of radioactive materials, even under severe conditions, such as fire or impact.

Choosing B highlights the key aspect that special form containers focus on controlling external radiation hazards. These containers are engineered to ensure that external radiation levels remain low, providing a significant safety improvement in scenarios where the container might be subjected to stress or damage. This characteristic is crucial for protecting personnel and the environment from radiation when handling or transporting radioactive materials.

In contrast, other options suggest misunderstandings about the unique protections that special form containers provide. For instance, while A1 may imply a containment issue, special form containers are specifically designed to withstand potential rupture. The reference to internal contamination in D does not accurately encapsulate the purpose of special form containers, which aims more at controlling external radiation hazards rather than internal exposure implications. Thus, the correct understanding is that special form containers indeed focus on managing and mitigating external radiation hazards, reinforcing their design and use within radiation safety protocols.