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

• 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。
• ( combining form) indicating radiation or radioactivity.
  （化和形式）指示放射或放射能的。
• 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。
• Some of that radioactivity could carry in the atmosphere to the west coast of the United States.
  某些核辐射可能通过空气传播到美国西海岸。
• People had no idea of radioactivity before Curie discovered redium.
  直到居里夫人发现镭后，人们才了解放射性。
• A metal called uranium gave off a kind of radiation, which Marie Curie later called radioactivity.
  一种叫铀的金属发出一种射线，后来玛丽·居里把这种现象称为放射性。
• Exhibiting or caused by radioactivity.
  显示出放射能或者由放射能导致的。
• Conclusion It was succeed keys to treat and nurse of esophagitis of radioactivity.
  结论放射性食管炎的治疗和护理，是放疗成败的关键。
• Here, therefore, we have a true radioactivity which is made evident by the emission of positive electrons.
  我们因此获得了一种通过排斥正电子表现出来的真正的放射现象。
• 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。