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Enriched tungsten disulfide ( 186 WS 2 ) was evaluated at increasing proton beam currents (20–50 μA) and times (up to 4 h) on a GE PETtrace cyclotron for production of high specific activity (HSA)  186 Re. The HSA  186 Re was separated from the irradiated target as [ 186 Re][ReO 4 ] –  by a liquid–liquid extraction method and radiolabeled with a new N 2 S 2  ligand (222-MAMA- N -ethylpropionate). The enriched  186 W was recovered from the extraction process, analyzed for purity and enrichment, and converted back to the disulfide ( 186 WS 2 ). The results demonstrate that the  186 WS 2  is an easily pressed target material that can withstand relatively high currents and can be readily recovered and recycled. The  186 Re produced was isolated in high specific activity and readily formed the radiotracers [ 186 Re][ReO(222-MAMA- N -ethylpropionate)] and [ 186 Re][Re(CO) 3 (OH 2 ) 3 ]  + .

radiochimica acta

Evaluation of  186 WS 2  target material for production of high specific activity  186 Re via proton irradiation: separation, radiolabeling and recovery/recycling