radioactivity
noun/ˌreɪdiəʊækˈtɪvəti/
/ˌreɪdiəʊækˈtɪvəti/
[uncountable]- harmful radiation that is sent out when the nuclei (= central parts) of atoms are broken up
- the study of radioactivity
- a rise in the level of radioactivity
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radioactivity