Which zone contains radioactive systems and has the highest possibility of contamination?

• A. Zone 1: not radiological, no radiation systems, no loose contamination, cafeteria location
• B. Zone 2: may contain radioactive systems, potential cross contamination from zone 3, personal clothing or provided blue coveralls
• C. Zone 3: contains radioactive systems, highest possibility contamination, should be no loose contamination, blue coveralls or personal clothing
• D. Un-zoned: Radioactive material may be transported through. Expected to be free of contamination

Answer: (C)

The zone with the highest risk of contamination is the one that actually contains radioactive systems and requires the strictest controls to prevent spread. Zone 3 fits this: it contains radioactive systems and has the highest possibility of contamination. That’s why the guidelines emphasize no loose contamination and require protective clothing such as blue coveralls or personal clothing to keep contamination from dispersing to other areas.

In contrast, Zone 2 may have radioactive systems but is described as having only potential cross-contamination from Zone 3, so the risk isn’t as high as Zone 3. Zone 1 is not radiological at all, and the Un-zoned area is for transport and is expected to be free of contamination. Thus, Zone 3 is the correct choice because it combines the presence of radioactive systems with the greatest contamination risk and the strongest containment measures.