radioactivity

英 [ˌreɪdiəʊæk'tɪvəti]

美 [ˌreɪdioʊæk'tɪvəti]

n.  放射性; 放射(现象)

复数：radioactivities　

CET4CET6TEM4TEM8化学

BNC.16448 / COCA.20084

柯林斯词典

• ADJ-GRADED 放射性的;有辐射的
  Something that isradioactivecontains a substance that produces energy in the form of powerful and harmful rays.
  1. The government has been storing radioactive waste at Fernald for 50 years.
     政府在弗纳德存放放射性废料已达50年之久。

英英释义

noun

• the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
  Synonym:radiation

双语例句

• There is concern about the amount of radioactivity being released into the environment.
  人们对释放进环境的辐射量表示不安。
• We have to learn to control radioactivity.
  我们必须学会控制放射能。
• Exhibiting or caused by radioactivity.
  显示出放射能或者由放射能导致的。
• Instead they found little more than background levels of radioactivity.
  然而，他们只发现了和背景放射性差不多的放射性水平。
• This example illustrates the great sensitivity of the radioactivity method.
  这个例子说明了放射性方法很灵敏。
• Radioactivity provides an extremely sensitive method of analysis since disintegration of individual nuclei are monitored.
  因此放射现象可以监视每一个核的裂变，因此放射现象提供了一个极灵敏的分析方法。
• Instruments that can detect minute amounts of radiation for measuring doses of ionizing radiation ( X-rays or radioactivity).
  能检测极微量辐射的仪器测量致电离辐射量的仪器。
• With radioactivity, if you give me a single atom of uranium, I can tell you it will eventually decay.
  就放射性现象来说，你如果给我一个铀原子，我可以告诉你它最终会衰变。
• Radioactivity is a special quality of radium.
  放射性是镭的一种特性。
• This conviction was based solely on the atomic nature of radioactivity.
  我们的这种信念完全依赖于原子的放射性属性。