 In this study, the Ulthas investigated the effectiveness of immobilised orange peel for the removal of thorium from aqueous solutions. They found that the biosorption process reached equilibrium after approximately 10 hours of contact time. The Ulthas also determined the maximum adsorption capacity of the immobilised orange peel for thorium to be 29.58mg per g using the Langmuir isotherm. This article was authored by early AGH camps, Soraba legalbanion, UNesumony and others.