[On the maximum permissable concentration of thoron (Rn-220) and its daughter products in the air of industrial premises].
D000398:Air Pollution, Radioactive / Q000032:analysis*; D004781:Environmental Exposure; D009787:Occupational Medicine; D011886:Radon
D011886:Radon
O predel'no dopustimykh kontsentratsiiakh torona (Rn220) i ego dochernikh produktov v vozdukhe rabochikh pomeshcheniĭ.