Abstract. Copper-61 ( 61 Cu) shares with 64 Cu certain advantages for PET diagnostic imaging, but has a shorter half-life (3.4hr vs. 12.7hr) and a greater probability of positron production per disintegration (61% vs. 17.9%). One important application is for in vivo imaging of hypoxic tissue. In this study 61 Cu was produced using the 64 Zn(p,D) 61 Cu reaction on natural Zn or enriched 64 Zn targets. The enriched 64 Zn (99.82%) was electroplated onto high purity gold or silver foils or onto thin Al discs. A typical target bombardment used 30PA; at 11.7, 14.5 or 17.6MeV over 30-60min. The 61 Cu (radiochemical purity of >95%) was separated using a combination of cation and anion exchange columns. The 64 Zn target material was recovered after each run, for re-use. In a direct comparison with enriched 64 Zn-target results, 61 Cu production using the cheaper nat Zn target proved to be an effective alternative.