ra·dio·ac·tive /ˌredioˈæktɪv/
  (a.)放射性的,有放射能的
  ra·dio·ac·tive /ˌredɪoˈæktɪv/ 形容詞
  放射性的,放射的
  ra·di·o·ac·tive a.
  1. Physics Capable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation. [obsolete]
  ◄ ►
  radioactive
       adj : exhibiting or caused by radioactivity; "radioactive
             isotope"; "radioactive decay"; "radioactive fallout"
             [ant: nonradioactive]