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The high bolus volumes (20–40mL) of the generator-produced Rhenium-188 require post elution concentration of the eluate for the preparation of a dissolved β −  source and radiopharmaceuticals labeled with Re-188 for radiotherapy. Solvent extraction of  188 Re in methyl ethyl ketone was studied. With the increase of organic phase volume, extraction of  188 Re was enhanced while mixing time of aqueous and organic phases did not show any significant effect on the extractability of  188 Re in the organic phase. Almost 80% of  188 Re was extracted in methyl ethyl ketone at a volume ratio of 1:2 for aqueous and organic phases. By evaporation/distillation of methyl ethyl ketone,  188 Re was concentrated and dissolved in the desired volume of physiological saline.

Extraction of medically interesting 188 Re-perrhenate in methyl ethyl ketone for concentration purposes