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。
• 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。
• ( combining form) indicating radiation or radioactivity.
  （化和形式）指示放射或放射能的。
• 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。
• 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。
• 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 example illustrates the great sensitivity of the radioactivity method.
  这个例子说明了放射性方法很灵敏。
• 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。
• 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。
• Some rare metals have radioactivity.
  某些稀有金属具有放射性。