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

• 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。
• We have to learn to control radioactivity.
  我们必须学会控制放射能。
• The ability of radiation to induce radioactivity in food is related to its energy.
  辐照所引起的使食物具有放射性的能力是与辐照的能量有关的。
• Detects the presence of radio signals or radioactivity.
  探测无线电信号或放射能的存在。
• 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。
• 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。
• 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。
• 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 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。