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203 Pb is a promising radioisotope in the field of medical science as an imaging surrogate of  212 Pb. In the present investigation  203 Pb was produced by proton irradiation of natural Tl 2 CO 3  target and was separated from the bulk Tl target using calcium alginate (CA) hydrogel beads with a high separation factor (3.8×10 4  at 10 −3  M HNO 3 ). During the separation process  203 Pb was encapsulated in CA beads and desorption of the radioisotope could only be achieved in 1M HNO 3 . Possibility of Tl uptake was also checked in Fe doped CA (Fe-CA) beads after oxidation of Tl(I) to Tl(III) by sodium bismuthate. No significant uptake of Tl(III) was noticed in the Fe-CA beads. The matrix is therefore suitable for isolation of  203 Pb from the target as well as its storage in the bead for therapeutic as well as diagnostic purpose.

Separation of no-carrier-added 203 Pb, a surrogate radioisotope, from proton irradiated nat Tl 2 CO 3 target using calcium alginate hydrogel beads