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 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。
• Detects the presence of radio signals or radioactivity.
  探测无线电信号或放射能的存在。
• Radioactivity is a special quality of radium.
  放射性是镭的一种特性。
• ( combining form) indicating radiation or radioactivity.
  （化和形式）指示放射或放射能的。
• Conclusion It was succeed keys to treat and nurse of esophagitis of radioactivity.
  结论放射性食管炎的治疗和护理，是放疗成败的关键。
• 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。
• 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。
• Here, therefore, we have a true radioactivity which is made evident by the emission of positive electrons.
  我们因此获得了一种通过排斥正电子表现出来的真正的放射现象。
• 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。