Test for radon today
Radon is a gaseous radioactive element having the symbol Rn, the atomic number 86, an atomic weight of 222, a melting point of -71ºC, a boiling point of -62ºC, and (depending on the source, there are between 20 and 25 isotopes of radon – 20 cited in the chemical summary, 25 listed in the table of isotopes); it is an extremely toxic, colorless gas; it can be condensed to a transparent liquid and to an opaque, glowing solid; it is derived from the radioactive decay of radium and is used in cancer treatment, as a tracer in leak detection, and in radiography. (From the word radium, the substance from which it is derived.
Radon is measured in picocuries per liter of air (pCi/L), a measurement of radioactivity. The Environmental Protection Agency and the Centers for Disease Control and Prevention recommend that homes with radon levels at 4 pCi/L or higher should be fixed to reduce radon levels. The average indoor air concentration in Pennsylvania basements is 7.1 pCi/l and is 3.6 pCi/L on the first floor.
Content source : United States Environmental Protection Agency
Sources: Condensed Chemical Dictionary, and Handbook of Chemistry and Physics, 69th ed., CRC Press, Boca Raton, FL, 1988