[rey-dee-oh-ak-tuh-veyt] /ˌreɪ di oʊˈæk təˌveɪt/
verb (used with object), radioactivated, radioactivating. Physics.
to make (a substance) .
(transitive) to make radioactive
[rey-dee-oh-ak-tiv] /ˌreɪ di oʊˈæk tɪv/ adjective, Physics, Chemistry. 1. of, pertaining to, exhibiting, or caused by . /ˌreɪdɪəʊˈæktɪv/ adjective 1. exhibiting, using, or concerned with radioactivity adj. 1898, from French radio-actif, coined by Pierre and Marie Curie from radio-, comb. form of Latin radius (see radiation) + actif “active” (see active). radioactive ra·di·o·ac·tive (rā’dē-ō-āk’tĭv) adj. […]
noun 1. . noun 1. any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product. noun 1. another term for radiometric dating noun 1. any method of dating material based on […]
- Radioactive constant
radioactive constant n. See decay constant.
noun, Physics. 1. (def 8). noun 1. disintegration of a nucleus that occurs spontaneously or as a result of electron capture. One or more different nuclei are formed and usually particles and gamma rays are emitted Sometimes shortened to decay Also called disintegration radioactive decay (rā’dē-ō-āk’tĭv) The spontaneous transformation of an unstable atomic nucleus into […]