Separation of Carrier-Free 115mIn from Its Parent 115Cd Using the Synthesized TODGA-Impregnated Silica Gel

Abstract

A radiotracer technique has been used to achieve the carrier-free separation of ^115mIn from its parent ¹¹⁵Cd in hydrochloric acid medium on a chromatographic column packed with TODGA-impregnated silica gel. At 8 M HCl, both cations are bound at the chelating site, which results in maximum adsorption. When the column is treated with 2 M HCl, the daughter complex gets desorbed and is eluted from the column, whereas the parent remains undisturbed. Pure silica gel does not adsorb radioactivity under these conditions. The radiochemical purity of daughter was checked by its half-life (4.49 h).