Which term describes the deposition of radioactive material in locations where its presence is not desired?

• A. Radioactive contamination
• B. MRI
• C. CT
• D. Contrast resolution

Answer: (A)

Radioactive contamination is the unwanted presence of radioactive material on surfaces, objects, or within living beings. It can be external (on skin or equipment) or internal (inhaled or ingested) and is about where the material ends up, not the amount of radiation dose itself. The other options refer to imaging techniques or image quality, not to the deposition of radioactive material in undesired locations. Thus, the term that fits is radioactive contamination.