ABSTRACT
Radon results from the natural decay of radium-226 which in turn is a decay product of uranium-238. Since radon is a gas it may easily escape into air from the material in which is formed and since uranium and radium occur widely in rocks, soils and water, radon is naturally present in the air that we inhale, outdoors and indoors, as well as dissolved in groundwater (IAEA, 2003; Robertson et al., 2013). In addition, radon has a half-life of 3.82 days which allows a large period of time for migration before it decays into another nuclide (Dinis and Fiúza, 2005).
