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radioactivity

noun
🔊/ˌreɪdiəʊækˈtɪvəti/
🔊/ˌreɪdiəʊækˈtɪvəti/
 [uncountable]
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  1. harmful radiation that is sent out when the nuclei (= central parts) of atoms are broken up放射性的；有辐射的
    • the study of radioactivity放射性研究
    • a rise in the level of radioactivity辐射强度的增加
    Topics Physics and chemistryc1