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

• 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。
• 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。
• The absorption of haematomas was assessed quantitatively by daily measurement of the radioactivity and compared intraindividually.
  血肿的吸收通过每日定量地测定放射活性进行比较。
• 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。
• 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。
• 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。
• 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。
• Radioactivity is a special quality of radium.
  放射性是镭的一种特性。
• Exhibiting or caused by radioactivity.
  显示出放射能或者由放射能导致的。
• The decrease in percentage difference of radioactivity over these two sites indicates the rate of thrombus dissolution.
  两部位放射活性百分比差异的减少提示了血栓的分解率。