Radioactive contamination is best described as

• A. Radioactive material in an unintended location
• B. A stable isotope produced in reactors
• C. The heat generated by decay
• D. An energy burst emitted by a nucleus

Answer: (A)

Radioactive contamination means radioactive material is present where it shouldn’t be—on surfaces, equipment, or people. It’s about the material being in an unintended location and potentially spreading or causing internal exposure if it’s transferred into the body. That’s why the best description is “radioactive material in an unintended location.”

This differs from decay heat—the heat produced by radioactive decay—which is a energy effect, not an issue of the material being in the wrong place. It also differs from a radiation burst emitted by a nucleus, which is about the energy emitted, not the material staying where it isn’t supposed to be. And a stable isotope produced in reactors isn’t necessarily contamination; a stable isotope isn’t radioactive, so it wouldn’t pose the same contamination risk.