Explain why a contaminated object can continue to emit radiation.

Within Radioactive contamination, this learning objective asks you to explain why a contaminated object can continue to emit radiation. Focus on the approved ideas contaminated, object, continue, emit, radiation and connect them clearly to Atoms and nuclear radiation. A strong response should state the relevant particle, radiation, isotope, decay, half-life or nuclear-equation idea, then explain how it answers the exact command word. Avoid swapping nearby concepts such as atomic number and mass number, isotope and ion, alpha, beta and gamma radiation, or contamination and irradiation.