Radon and its daughters in European mines.
D000398:Air Pollution, Radioactive; D001729:Bismuth; D005060:Europe; D007854:Lead; D008906:Mining / Q000592:standards*; D011059:Polonium; D011886:Radon; D017687:Radon Daughters
D017687:Radon Daughters; D007854:Lead; D011059:Polonium; D011886:Radon; D001729:Bismuth