Radoactive+Elements

https://cheec.uiowa.edu/sites/cheec.uiowa.edu/files/radon_occ.pdf Radon progeny is another name for the 222 Rn decay products or 222 Rn daughters. Radon progeny rather than 222Rn gas deliver the actual radiation dose to lung tissues. The solid airborne 222 Rn progeny, particularly 218 Po, 214 Pb, and 214 Bi, are of health importance because they can be inspired and retained in the lung. The radiation released during the subsequent decay of the alpha-emitting decay products 218 Po and 214 Po delivers a radiologically significant dose to the respiratory epithelium.