radon

名词 radon:

1. a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
   同义词：Rn, atomic number 86

1. Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.
   射气几种氡的同位素的放射性气体，是放射性物质衰变的产物
2. A radioactive, inert, gaseous isotope of radon, with a half-life of3.92 seconds.
   锕射气氡的一种放射性的，惰性的和气态的同位素，其半衰期为3。92秒

ra.don

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 8'; melting point -7=C; boiling point -'.8=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8'；熔点-7=C；沸点-'.8=C；比重（固态）4参见 element

来源：
rad(ium)
rad(ium)
-on 2
-on2