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.
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。

noun

the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
Synonym:radiation

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。
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。
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。
Equipment used to treat diseases with x-rays or radioactivity.
利用x光或放射能治疗疾病的装备。
A metal called uranium gave off a kind of radiation, which Marie Curie later called radioactivity.
一种叫铀的金属发出一种射线，后来玛丽·居里把这种现象称为放射性。
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。
Some rare metals have radioactivity.
某些稀有金属具有放射性。
The air survey is specially superior in the regional environmental radioactivity survey, which is recommended by IAEA.
在区域环境放射性测量中，航测具有特殊的优势，是IAEA推荐的手段。
( combining form) indicating radiation or radioactivity.
（化和形式）指示放射或放射能的。