. . . . . . . "SDN:P01::CTH88037" . "total_Th_aerosol" . . . . . "A generic code for the quantity or mass of the specified substance in the aerosols normalised to one unit volume of atmosphere."@en . . . "Concentration of thorium {Th CAS 7440-29-1} per unit volume of the atmosphere [aerosol phase]"@en . "accepted"@en . . . . . . .