Define radioactive contamination as the unwanted presence of radioactive atoms on or inside an object or person.

Radioactive contamination refers to the unwanted presence of radioactive atoms on or inside an object or person. This can occur when radioactive materials are released into the environment, leading to the contamination of surfaces, food, or living organisms. Unlike irradiation, which involves exposure to radiation without the presence of radioactive material, contamination poses a direct risk as the contaminated objects can continue to emit radiation. This can result in harmful effects, such as increased cancer risk or cellular damage, highlighting the importance of safety measures when handling radioactive substances.