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 example illustrates the great sensitivity of the radioactivity method.
  这个例子说明了放射性方法很灵敏。
• 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。
• Detects the presence of radio signals or radioactivity.
  探测无线电信号或放射能的存在。
• 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。
• 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。
• 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。
• ( combining form) indicating radiation or radioactivity.
  （化和形式）指示放射或放射能的。
• With radioactivity, if you give me a single atom of uranium, I can tell you it will eventually decay.
  就放射性现象来说，你如果给我一个铀原子，我可以告诉你它最终会衰变。
• We have to learn to control radioactivity.
  我们必须学会控制放射能。
• 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。