FIELD: chemical industry; production of hexacyanoferrate-containing sorbent metal compounds used to recover cesium radionuclides from aqueous solutions; radiation protection engineering. SUBSTANCE: fibrous or granulated cellulosic medium is first treated with sodium hydroxide solution, then with hydrochloric acid solution and ammonium chloride solution, followed by washing it with distilled water and drying. Cellulosic medium is then treated with alkali metal hexacyanoferrate solution and with salt solution of transition metal forming difficult-to-dissolve hexacyanoferrates. EFFECT: prolonged service life of sorbent and its greater activity. 4 cl, 1 tbl
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