The occurrence of radioactive elements in natural gas.
D000388:Air / Q000032:analysis; D000818:Animals; D005579:Fossil Fuels / Q000032:analysis*; D006207:Half-Life; D006801:Humans; D007221:Industry; D011059:Polonium / Q000032:analysis; D011868:Radioisotopes / Q000009:adverse effects / Q000032:analysis*; D011886:Radon; D012306:Risk; D013910:Thorium / Q000032:analysis; D014501:Uranium / Q000032:analysis
D005579:Fossil Fuels; D011868:Radioisotopes; D014501:Uranium; D013910:Thorium; D011059:Polonium; D011886:Radon