Radon Progeny 2
Radon Progeny 2 : The short lived radioactive decay products of radon-222. This includes the decay chain up to but not including 210Pb, namely, polonium-218 (sometimes called radium A), lead-214 (radium B), bismuth-214 (radium C) and polonium-214 (radium C'), plus traces of astatine-218, thallium-210 (radium C.) and lead-209. Lead-210 (radium D), which has a half-life of 22.3 years, and its radioactive progeny - bismuth-210 (radium E) and polonium-210 (radium F), plus traces of mercury-206 and thallium-206 - are, strictly, progeny of radon-222, but are not normally included in the meaning of the term radon progeny, because they will not normally be present in significant amounts in airborne form. The stable decay product lead-206 is sometimes known as radium G
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