Explain why a contaminated object can continue to emit radiation.

A contaminated object can continue to emit radiation because it contains radioactive atoms that are unstable. These atoms undergo radioactive decay, emitting radiation as they transform into more stable forms. As long as these radioactive atoms remain present, the object will emit radiation.

This answer demonstrates an understanding of the concept of radioactive contamination and the process of radioactive decay. It tests the student's ability to explain the ongoing emission of radiation from contaminated materials, which is a key aspect of the learning objective.