In the context of nuclear safety, what describes the escape of radioactive material from its designated location?

• A. Containment
• B. Contamination
• C. Irradiation
• D. Activation

Answer: (B)

The main idea is distinguishing between keeping radioactive material in its proper place and what happens when it moves to places it shouldn’t. When radioactive material escapes its designated location, it is contamination—the material is now present on surfaces, equipment, or people where it does not belong and can spread to other areas. Containment, by contrast, refers to the barriers and systems that are supposed to keep the material from escaping in the first place, so it describes preventing release rather than the release itself. Irradiation is about exposure to radiation and the dose received, which can occur whether or not the material has escaped containment. Activation is a process that makes materials radioactive through exposure to neutrons or other particles, not about the material’s location being compromised.