radon
[ rey-don ]
/ ˈreɪ dɒn /
noun 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.
Words nearby radon
British Dictionary definitions for radon
radon
/ (ˈreɪdɒn) /
noun
a colourless radioactive element of the rare gas group, the most stable isotope of which, radon-222, is a decay product of radium. It is used as an alpha particle source in radiotherapy. Symbol: Rn; atomic no: 86; half-life of 222 Rn: 3.82 days; valency: 0; density: 9.73 kg/m³; melting pt: –71°C; boiling pt: –61.7°C
Word Origin for radon
C20: from
radium +
-on
Medical definitions for radon
radon
[ rā′dŏn ]
n. Symbol Rn
A radioactive, largely inert gaseous element formed by the radioactive decay of radium and used as a radiation source in radiotherapy and research; its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86.
Scientific definitions for radon
radon
[ rā′dŏn ]
Rn
A colorless, odorless, radioactive element in the noble gas group. It is produced by the radioactive decay of radium and occurs in minute amounts in soil, rocks, and the air near the ground. Radon is used as a source of radiation for the treatment of cancer and other diseases. Its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point -71°C; boiling point -61.8°C; specific gravity (solid) 4. See Periodic Table.
Cultural definitions for radon
radon
[ (ray-don) ]
A colorless, odorless, radioactive gas that is produced by the decay of radium in the soil.
notes for radon
Radon seeping through the ground and into buildings is a major source of indoor
air pollution and may represent a significant risk for lung
cancer.