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

• 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。
• Potassium iodide can be used to counteract radioactivity.
  碘化钾可以用于阻碍辐射损害。
• 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。
• 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。
• 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。
• 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。
• 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。
• Radioactivity is a special quality of radium.
  放射性是镭的一种特性。
• 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。
• Some rare metals have radioactivity.
  某些稀有金属具有放射性。