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A method based on ion exchange chromatography is presented for the recovery of  201 Tl and its precursor  201 Pb from proton bombarded natural thallium cyclotron targets. After bombardment the target is dissolved in diluted nitric acid. Water, hydrazine and ammonium acetate are added to the solution and the lead radioisotopes separated from the thallium by cation exchange chromatography on a Bio-Rex 70 column. The sorbed lead radioisotopes are eluted with dilute nitric acid and the separation repeated on a second Bio-Rex 70 column. After elution of the remaining thallium the column is left for 32 hours and the  201 Tl formed by decay of  201 Pb is eluted with an ammonium acetate solution. The  201 Tl eluate is acidified with a HNO 3 -HBr-Br 2  mixture and the resulting solution is passed through an AG MP-1 anion exchanger column to remove any remaining lead isotopes. The  201 Tl is eluted with a hydrazine solution, the eluate evaporated to dryness and the  201 Tl finally dissolved in an appropiate solution to produce a  201 TlCl solution suitable for medical use. A high quality  201 Tl product is obtained containing ≤0.1 μg of Tl/mCi (37 MBq)  201 Tl. The radionuclidic impurities are less than the maximum values specified by the US Pharmacopoeia and the British Pharmacopoeia.

Recovery of 201 Tl by ion exchange chromatography from proton bombarded thallium cyclotron targets