This work describes the production of very high specific activity 66/68Ga from natZn(p,n) and 66Zn(p,n) using proton irradiations between 7 and 16 MeV, with emphasis on 66Ga for use with common bifunctional chelates. Principle radiometallic impurities are 65Zn from (p,x) and 67Ga from (p,n). Separation of radiogallium from target material is accomplished with cation exchange chromatography in hydrochloric acid solution. Efficient recycling of Zn target material is possible using electrodeposition of Zn from its chloride form, but these measures are not necessary to achieve high specific activity or near-quantitiative radiolabeling yields from natural targets. Inductively coupled plasma mass spectroscopy (ICP-MS) measures less than 2 ppb non-radioactive gallium in the final product, and the reactivity of 66Ga with common bifunctional chelates, decay corrected to the end of irradiation, is 740 GBq/μmol (20 Ci/μmol) using natural zinc as a target material. Recycling enriched 66Zn targets increased the reactivity of 66Ga with common bifunctional chelates.

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