A naturally radioactive element with atomic symbol Rn, and atomic number 86. It is a member of the noble gas family found in soil, and is released during the decay of RADIUM.
Actinon,Thoron (Element)
D000388
Air
The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
D000398
Air Pollution, Radioactive
Contamination of air with radioactive substances.
Radioactive Air Pollution,Pollution, Radioactive Air
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