The commercial cation exchangers TSKgel BioAssist S, TSKgel CM-2SW and TSKgel CM-STAT have been used for the separation of 111 In (III) from Cd (II) and Cu (II) ions. The separation was carried out using low cost cation exchangers based on the differences in the sorption affinity of In, Cu and Cd towards the ion exchanger from 0.01 mol L -1 HCl. The effects of various parameters such as shaking time, HCl concentration and acetate buffer concentration were examined. A comparative study between cation exchangers showed the best one for radiochemical separation yielded more than 98% within 50 min by using column study.Conventional techniques were reported for separation of In-111 from Cd target using different types of cation exchangers [7], and synthetic polymeric resins [8]. A chromatographic method using inorganic ion exchanger (zirconium oxide) for radiochemical separation of non-carrier added In-115 from Cd-115 over a column of zirconium oxide was described [9]. Recently, numerous alternative techniques have been examined for the separation of indium from cadmium and copper using silica extracted agricultural wastes. Column separation technique is widely applied to separate 111 In from interfering ions based on the evaluation of distribution coefficient K d .Modern separation techniques for separation of Ga(II) using poly(acrylamide-acrylic acid disodium EDTA) were studied. The prepared inorganic ion exchangers used separation of radioactive elements such as cesium [10].In the present work we investigated the possibility of using cation exchangers for separation of radioindium from cadmium and copper, the distribution coefficients of the three elements on different types of cation exchangers were measured in 0.01 M HCl, acetate buffer at pH 4 and EDTA (10 -3 M) to find the best conditions for separation. Materials and Methods MaterialsIndium metal (99.9% purity,), anhydrous cadmium chloride (CdCl 2 ), cupric chloride dehydrate (CuCl 2 .2H 2 O), sodium hydroxide (NaOH), anhydrous sodium acetate (CH 3 COONa), Diethylene Tetramine Penta Acetic acid (DTPA), and Ethylene Diamine Tetra Acetic acid (EDTA) were reagent grade chemicals and supplied by Merck (Darmstadt, Germany). Chemical Sciences JournalChem ic a l S cience s J o u rnal