氡

[dōng]

• radon
• niton
• RN

参考释义

氡 [dōng]

• -

例句

1. 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
   A radioactive, inert, gaseous isotope of radon, with a half-life of3.92 seconds.
2. 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
   Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.