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A fast and efficient process for the production of the PET radionuclide  73 Se was developed using  75 Se as a surrogate.  75 Se was separated from proton irradiated arsenic trioxide by reaction with 2,3-diaminonaphthalene to 4,5-[ 75 Se]benzopiazelenol. This compound was purified using SPE column chromatography and subsequently decomposed with hydrogen peroxide. For further chemical conversions [ 75 Se]selenite was reduced to elemental [ 75 Se]selenium by either using thiosulfate or sulfur dioxide. The recovery yield of  75 Se from the target amounted to 43%. The utility of the isolated  75 Se for radiosyntheses was demonstrated by the successful preparation of [ 75 Se]selenomethionine. The methodology developed using  75 Se was successfully transformed to  73 Se.

Isolation of high purity 73 Se using solid phase extraction after selective 4,5-[ 73 Se]benzopiazselenol formation with aminonaphthalene