Moisture and 222Rn emanation.
D005740:Gases; D011886:Radon; D012989:Soil Pollutants; D012990:Soil Pollutants, Radioactive; D014867:Water
D005740:Gases; D012989:Soil Pollutants; D012990:Soil Pollutants, Radioactive; D014867:Water; D011886:Radon