单词 | radium |
释义 | radium['reidiəm]n. 镭【化】 镭Ra【医】 镭(88号元素) radium ra.di.um AHD: [r³“d¶-…m] D.J. [6re!di8*m]K.K. [6redi*m]n.Symbol Ra (名词)符号 Ra A rare, brilliant white, luminescent, highly radioactive metallic element found in very small amounts in uranium ores, having 13 isotopes with mass numbers between 213 and 230, of which radium 226 with a half-life of 1,622 years is the most common. It is used in cancer radiotherapy, as a neutron source for some research purposes, and as a constituent of luminescent paints. Atomic number 88; melting point 700&9{=}C; boiling point 1,737&9{=}C; valence 2.See table at element 镭:一种稀有的、有白色光泽、发光、高度放射性的金属元素,极少量地存在于沥青矿中,有13种同位素,质量数介于213和230之间,最常见的为镭226,半衰期为1,622年。镭可用于癌症的放射治疗,在其它一些研究中用作中子源,还可用作发光颜料的成分。原子序数88;熔点700&9{=}C;沸点1,737&9{=}C;原子价2参见 element语源:1. Latin radius [ray] 拉丁语 radius [射线] 2. -ium -ium |
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