音标：[.reidiәuæk'tiviti] ；

n. 放射性
[化] 放射性

n the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

词型变化：名词复数形式 : radioactivities
考试类型：[四级/六级]

词性分布：

名词100%

radioactivity的用法和样例：

例句

用作名词(n.)

Radioactivity is a special quality of radium.放射性是镭的一种特性。
The soil contains 30 times the acceptable level of radioactivity.这片土壤受到了高于标准30 倍的辐射。

词汇搭配

radioactive放射性的
radioactivity strength放射性强度
dustborne radioactivity放射性尘埃
radioactivity logging放射性测井
artificial radioactivity感生放射性,人工放射...
natural radioactivity天然放射性
contained radioactivity控制放射性
airborne radioactivity大气中的放射性, 气...
specific radioactivity放射性比度,比放射性...
radioactivity decay放射性衰变
contaminating radioactivity污染的放射性...
radioactivity protection放射性防护
radioactivity detection放射性探测
radioactivity absorber放射性吸收剂...
induced radioactivity感应放射性,感生放射...
radioactivity prospecting放射性勘探,电探...
alpha radioactivity放射能
radioactivity meter放射性测量计...
radioactivity determination放射法测定
atmospheric radioactivity大气放射性

【近义词】

radiation辐射
particle emission粒子发射
energy精力
fallout原子尘的降下...

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学英语单词

anodal light(brush discharge at anode)