radioactivity

名词 radioactivity:

1. the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
   同义词：radiation

1. A damaged reactor leaking radioactivity into the atmosphere.
   一座损坏的反应堆向大气中泄露出发射性物质
2. Russian-born American nuclear physicist known for his work on radioactivity and genetic information as well as his books popularizing theories of physics.
   伽莫夫，乔治1904－1968俄国裔的美国核物理学家，因在射线遗传信息方面的研究和有关普及物理理论的书籍而闻名于世
3. Relating to or caused by radioactivity.
   放射产生的关于放射性的或由放射性引起的

ra.di.o.ac.tiv.i.ty

n.（名词）
Spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.
自动放射：自动地发出辐射，直接源于不稳定的原子核或是作为核反应的结果
The radiation, including alpha particles, nucleons, electrons, and gamma rays, emitted by a radioactive substance.
辐射：由一种放射性物质发出的辐射，包括α粒子、原子核、电子、和γ射线