单词 | radon |
释义 | radon['reidɒn]n. 氡【化】 氡Rn【医】 氡(86号元素), 镭射气 radon ra.don AHD: [r³“d¼n] D.J. [6re!dKn]K.K. [6red$n]n.Symbol Rn (名词)符号 Rn A colorless, radioactive, inert gaseous element formed by the radioactive decay of radium. It is used as a radiation source in radiotherapy and to produce neutrons for research. Its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point &9{-}71&9{=}C; boiling point &9{-}61.8&9{=}C; specific gravity (solid) 4.See table at element 氡:一种无色、有放射性的惰性气体元素,由镭蜕变产生。在放射疗法中可用作辐射源,在科研中可用于制造中子。它最稳定的同位素是Rn222。半衰期为3.82天。原子序数86;熔点-71&9{=}C;沸点-61.8&9{=}C;比重(固态)4参见 element语源:1. rad(ium) rad(ium)2. -on 2-on2 |
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