This work presents an investigation on rose residue(olive pomace) as an adsorbent for the adsorption of radioactive ions of Thallium-201, which is one of the most widely used radionuclides in nuclear medicine, from waste water. The experimental parameters were chosen as temperature, pH, stirring speed, adsorbent dose and nominal particle size in the ranges of 10.0-40.0 ⁰C, 2.0-10.0, 300-720 rpm, 1.0-15.0 g/L, 0.15-0.71 mm, respectively. The most effective parameter was found to be pH of the solution and then the adsorption dose. Adsorption yield decreased with temperature. A high biosorption yield of 93,1 was obtained. Fourier transform infrared and (FTIR) was performed for the characterisation of the adsorption mechanism of olive pomace. The experimental data were found to be in good agreement with isotherm models of Freundlich, Halsey, Handerson, Smith and Dubinin-Radushkevich. Thermodynamic analysis gave negative values of G, and a negative value of H. It was obtained that the adsorption rate can be represented very well by second order pseudo homogeneous kinetic model. All the results proved that olive pomace makes an excellent adsorbent for Tl-201.