title: A method for measuring the working-level values of mixed radon and thoron daughters in coalmine air.
mesh_terms: D000398:Air Pollution, Radioactive / Q000032:analysis*; D003032:Coal Mining; D004781:Environmental Exposure; D006801:Humans; D009787:Occupational Medicine; D011834:Radiation Monitoring / Q000379:methods; D011886:Radon / Q000032:analysis*; D013910:Thorium / Q000032:analysis*
chemical_list: D013910:Thorium; D011886:Radon