title: Spot-welding solid targets for high current cyclotron irradiation.
abstract: Zirconium-89 finds broad application for use in positron emission tomography. Its cyclotron production has been limited by the heat transfer from yttrium targets at high beam currents. A spot welding technique allows a three-fold increase in beam current, without affecting89Zr quality. An yttrium foil, welded to a jet-cooled tantalum support base accommodates a 50µA proton beam degraded to 14MeV. The resulting activity yield of 48±4 MBq/(μA∙hr) now extends the outreach of89Zr for a broader distribution.
authors: Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, 1111 Highland Ave, Madison, WI 53705, United States.
authors: Paul A
authors: PA
authors: Ellison
authors: Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, 1111 Highland Ave, Madison, WI 53705, United States.
authors: Hector F
authors: HF
authors: Valdovinos
authors: Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, 1111 Highland Ave, Madison, WI 53705, United States.
authors: Stephen A
authors: SA
authors: Graves
authors: Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, 1111 Highland Ave, Madison, WI 53705, United States.
authors: Todd E
authors: TE
authors: Barnhart
authors: Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, 1111 Highland Ave, Madison, WI 53705, United States. Electronic address: rnickles@wisc.edu.
authors: Robert J
authors: RJ
authors: Nickles
keywords: (89)Zr; Cyclotron solid targetry; Spot welding; Ti-44; Zirconium-89; Zr-89