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Spot-welding solid targets for high current cyclotron irradiation.

Paul A Ellison1, Hector F Valdovinos1, Stephen A Graves1

  • 1Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, 1111 Highland Ave, Madison, WI 53705, United States.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|October 25, 2016
PubMed
Summary
This summary is machine-generated.

Improving positron emission tomography (PET) imaging, a new spot welding method enhances zirconium-89 (⁸⁹Zr) production. This technique increases beam current, leading to higher yields for broader ⁸⁹Zr distribution in medical applications.

Keywords:
(89)ZrCyclotron solid targetrySpot weldingTi-44Zirconium-89Zr-89

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Area of Science:

  • Nuclear Medicine
  • Radiochemistry
  • Medical Imaging

Background:

  • Zirconium-89 (⁸⁹Zr) is crucial for positron emission tomography (PET) imaging.
  • Current cyclotron production methods are limited by heat transfer issues with yttrium targets at high beam currents.
  • These limitations restrict the yield and availability of ⁸⁹Zr for widespread clinical use.

Purpose of the Study:

  • To overcome the limitations of ⁸⁹Zr cyclotron production.
  • To enhance heat transfer from yttrium targets during high beam current irradiation.
  • To increase the activity yield of ⁸⁹Zr for broader distribution.

Main Methods:

  • A novel spot welding technique was developed to attach yttrium foil to a tantalum support base.
  • The target assembly utilized jet cooling to manage heat dissipation.
  • Proton beam irradiation was performed at 50µA, with the beam energy degraded to 14MeV.

Main Results:

  • The spot welding technique enabled a three-fold increase in beam current capacity.
  • No compromise in the radiochemical quality of ⁸⁹Zr was observed.
  • An improved activity yield of 48±4 MBq/(μA∙hr) was achieved.

Conclusions:

  • The developed spot welding method effectively addresses heat transfer challenges in ⁸⁹Zr production.
  • This advancement significantly increases the production efficiency and yield of ⁸⁹Zr.
  • The enhanced production capacity will facilitate broader accessibility and application of ⁸⁹Zr in PET imaging.