Umarov Murat A. RussiaInstitute for Radiation Safety and Ecology of the National Nuclear Center, Republic of Kazakhstan, East Kazakhstan region, Kurchatov, 071100, Beibit atom 2umarov@nnc.kz Author's articles Pre-Concentration and Extraction of Samarium Isotopes by Precipitation of Slightly Soluble Hydroxides and Fluorides of Metals