单词	radioactive
释义	radioactive /ˌreɪdɪəʊˈaktɪv / adjective Emitting or relating to the emission of ionizing radiation or particles: radioactive decay the water was radioactive... They realized that the particles emitted by radioactive elements as they decay are in fact little bits of the atomic nuclei. Radon decays to form tiny radioactive particles, some of which remain suspended in the air. This three-year project was to lead to the discovery of the causes of radioactive emissions. Derivatives radioactively adverb ... It is unstable, and scientists know that it radioactively decays by electron emission to Nitrogen 14, with a half life of 5730 years. ‘There is likely to be an increase in radioactively contaminated metals and other radioactive sources entering the scrap supply chain,’ he said. Those four iron isotopes are all radioactively stable.
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