Patent Number: 
Section: claims

1. A process of producing essentially copper 64 -free copper 64  comprising: irradiating an enriched zinc 70  target with protons of an energy from about 10 MeV to about 25 MeV to produce copper 67 ; and,  separating copper 67  from the irradiated target to yield an essentially copper 64 -free copper 67  product having a copper 64  to copper 67  ratio of less than 0.1 to 1. 2. The process of  claim 1  further including separating enriched zinc 70  from the irradiated target and recycling the separated enriched zinc 70  into an enriched zinc 70  target for subsequent irradiation. claim 1 3. The process of  claim 1  wherein said enriched zinc 70  target contains at least about 70 percent zinc 70 . claim 1 4. The process of  claim 1  wherein said enriched zinc 70  target contains about 99 percent zinc 70 . claim 1