Abstract: A process for purifying a stock Sr-90 solution containing stable and radioactive impurities, holding the purified Sr-90 solution for Y-90 ingrowth, and subsequently extracting the Y-90 from the Sr-90/Y-90 solution. The stock solution is sequentially passed through two thermoxide-type sorbents (T-3 and T-5), which hold the impurities while passing the Sr-90 solution. After ingrowth of Y-90, the Sr-90/Y-90 solution is passed through sorbent T-3, which preferentially sorbs the Y-90 while passing the Sr-90 solution. The Y-90 is then eluted from the T-3 sorbent. The T-3 and T-5 sorbents are specially prepared compounds of zirconium dioxide and titanium dioxide, respectively, that preferentially sorb Y-90 under predetermined conditions of solution pH and NaCl concentration.

Abstract: A granulated inorganic sorbent having the formula:Ti.sub.x Zr.sub.y Sn.sub.1-x-y O.sub.2.nH.sub.2 Owhere 0<x+y<1, x=0-0.95, y=0-0.15, n=0.05-1.8, has a specific surface of 30-250 m.sup.2 /g and represents a solid solution with a rutile type structure characterized by principal peaks at the angle 2.theta. equal to 26.8.+-.0.7, 34.5.+-.1.5, 52.8.+-.1.5 degrees.The method of its manufacture comprises electrolysis of an aqueous solution containing tin chloride, titanium chloride and/or zirconium chloride at a molar ratio Ti:Zr:Sn=(0-0.95):(0.0.15):(0.03-1.0), followed by dropwise dispersion of the formed sol in a gelling liquid at pH.gtoreq.12 and heat treatment of the gel particles at a temperature within 20.degree. to 900.degree. C.