ra·di·o·ac·tiv·i·ty
noun/ˌreɪdiəʊækˈtɪvəti/
/ˌreɪdiəʊækˈtɪvəti/
[uncountable]- 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
- the study of radioactivity