radium

詳細解釋：

ra.di.um

n.Symbol Ra （名詞）符號 Ra
A rare, brilliant white, luminescent, highly radioactive metallic element found in very small amounts in uranium ores, having 3 isotopes with mass numbers between 23 and 230, of which radium 22' with a half-life of ,'22 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=C; boiling point ,737=C; valence 2.See table at element
鐳：一種稀有的、有白色光澤、發光、高度放射性的金屬元素，極少量地存在於瀝青礦中，有3種同位素，質量數介於23和230之間，最常見的為鐳22'，半衰期為,'22年。鐳可用於癌症的放射治療，在其它一些研究中用作中子源，還可用作發光顏料的成分。原子序數88；熔點700=C；沸點,737=C；原子價2參見 element

來源：
Latin radius [ray]
拉丁語 radius [射線]
-ium
-ium