[rey-dee-oh-ak-tiv] /ˌreɪ di oʊˈæk tɪv/
adjective, Physics, Chemistry.
of, pertaining to, exhibiting, or caused by .
exhibiting, using, or concerned with radioactivity
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)
Of or exhibiting radioactivity.
A descriptive term for a material made up of atoms in which radioactivity occurs.
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 […]
noun 1. a motor-vehicle tire in which the plies or cords run from one bead to the other at right angles to both beads.