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radon
(redirected from Emanation (chemistry))

    Also found in: Encyclopedia, Wikipedia, Hutchinson 0.06 sec.
radon /ra·don/ (ra´don) a gaseous radioactive element, at. no. 86, symbol Rn, resulting from decay of radium.
ra·don (rdn)
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.
radon,
n A byproduct of radium decomposition used in radiotherapy.
radon
a chemical element, atomic number 86, atomic weight 222, symbol Rn. See Table 6. Radon is a colorless, gaseous, radioactive element produced by the disintegration of radium.
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