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

• We have to learn to control radioactivity.
  我们必须学会控制放射能。
• Detects the presence of radio signals or radioactivity.
  探测无线电信号或放射能的存在。
• So the concentration of radioactivity in the seawater would still be quite low.
  因此海水中的放射性浓度仍将相当低。
• Radioactivity is the energy given off by rays from a few unstable elements such as uranium and thorium.
  放射性是某些不稳定元素如铀和钍的射线放射出来的能量。
• Cancer is no longer an incurable disease nowadays, it can be remedied by using radioactivity.
  如今癌症不再是不治之症了，它可以通过放射治疗。
• Some rare metals have radioactivity.
  某些稀有金属具有放射性。
• Radioactivity is the ejection of particles or radiation from the nucleus.
  放射性是原子从核中射出粒子或辐射的现象。
• This paper presents basic situation and survey methods of environmental radioactivity in Mongolia and Romania.
  本文介绍了蒙古和罗马尼亚两国环境放射性的基本态势，以及环境放射性调查方法等。
• 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。
• Equipment used to treat diseases with x-rays or radioactivity.
  利用x光或放射能治疗疾病的装备。