radon
/rey-don/US // ˈreɪ dɒn //UK // (ˈreɪdɒn) //
氡气,氡,氡氣,氡的
Definitions
n.名词 noun
- 1
Chemistry.
- : a chemically inert, radioactive gaseous element produced by the decay of radium: emissions produced by outgassing of rock, brick, etc. are a health hazard.Symbol: Rn; atomic number: 86; atomic weight: 222.
Examples
With federal assistance, Florida has acted on the recommendations of dozens of local health departments to investigate environmental pollution, like groundwater contamination or radon levels in the air.
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