[On the maximum permissible concentration of short-living daughters of radon fission].
D000397:Air Pollution / Q000517:prevention & control*; D035843:Biomedical Research; D006801:Humans; D019369:Life; D009679:Nuclear Family; D011883:Radium; D011886:Radon
D011886:Radon; D011883:Radium
AIR POLLUTION/prevention and control; RADIUM