radioactive isotope編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看radioactive isotoperadioactive isotope — 名詞名詞1. an atom that releases radiation as it decays1.名詞釋義放射性同位素an atom that releases radiation as it decays例句Doctors use a radioactive isotope to detect thyroid problems.