title: Thoron (220Rn) daughter to radon (222Rn) daughter ratios in thorium-rich areas.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D001729:Bismuth / Q000032:analysis*; D006798:Housing; D007854:Lead / Q000032:analysis*; D008906:Mining; D009664:Norway; D011059:Polonium / Q000032:analysis*; D017687:Radon Daughters
chemical_list: D000393:Air Pollutants; D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D007854:Lead; D011059:Polonium; D001729:Bismuth