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

• 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。
• 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。
• 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。
• Exhibiting or caused by radioactivity.
  显示出放射能或者由放射能导致的。
• 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。
• ( combining form) indicating radiation or radioactivity.
  （化和形式）指示放射或放射能的。
• Potassium iodide can be used to counteract radioactivity.
  碘化钾可以用于阻碍辐射损害。
• 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。
• Detects the presence of radio signals or radioactivity.
  探测无线电信号或放射能的存在。
• 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。