[en] It discusses the adsorption of radium by carbonaceous slate studied by the static adsorption method. The best conditions for the adsorption are equilibrium time 23 hours, solid to liquid ratio m/v 1:20 g x ml^-1, pH 7.8, and temperature 30 deg C. The adsorption at low concentration can be described well by Freundlich isotherm. (author) 6 refs.; 5 figs.; 5 tabs