radioactivity
英 [ˌreɪdiəʊæk'tɪvəti]
美 [ˌreɪdioʊæk'tɪvəti]
n. 放射性; 放射(现象)
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.- 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。
- The government has been storing radioactive waste at Fernald for 50 years.
英英释义
noun
- the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
双语例句
- Some rare metals have radioactivity.
某些稀有金属具有放射性。 - Detects the presence of radio signals or radioactivity.
探测无线电信号或放射能的存在。 - 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。 - We have to learn to control radioactivity.
我们必须学会控制放射能。 - 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。 - 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。 - 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。 - 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。 - 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。 - 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。