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Vortex Target: A New Design for a Powder-in-Gas Target for Large-Scale Radionuclide Production

GE Healthcare, Cygne Centre, De Rondom 8, 5612 AZ Eindhoven, The Netherlands
Instruments 2019, 3(2), 24; https://doi.org/10.3390/instruments3020024
Received: 29 December 2018 / Revised: 29 March 2019 / Accepted: 31 March 2019 / Published: 3 April 2019
(This article belongs to the Special Issue Instruments and Methods for Cyclotron Produced Radioisotopes)
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Abstract

This paper presents a design and working principle for a combined powder-in-gas target. The excellent surface-to-volume ratio of micrometer-sized powder particles injected into a forced carrier-gas-driven environment provides optimal beam power-induced heat relief. Finely dispersed powders can be controlled by a combined pump-driven inward-spiraling gas flow and a fan structure in the center. Known proton-induced nuclear reactions on isotopically enriched materials such as 68Zn and 100Mo were taken into account to be conceptually remodeled as a powder-in-gas target assembly, which was compared to thick target designs. The small irradiation chambers that were modeled in our studies for powdery ‘thick’ targets with a mass thickness (g/cm2) comparable to 68Zn and 100Mo resulted in the need to load 2.5 and 12.6 grams of the isotopically enriched target material, respectively, into a convective 7-bar pressured helium cooling circuit for irradiation, with ion currents and entrance energies of 0.8 (13 MeV) and 2 mA (20 MeV), respectively. Current densities of ~2 μA/mm2 (20 MeV), induces power loads of up to 4 kW/cm2. Moreover, the design work showed that this powder-in-gas target concept could potentially be applied to other radionuclide production routes that involve powdery starting materials. Although the modeling work showed good convective heat relief expectations for micrometer-sized powder, more detailed mathematical investigation on the powder-in-gas target restrictions, electrostatic behavior, and erosion effects during irradiation are required for developing a real prototype assembly. View Full-Text
Keywords: cyclotron; powder target; thermal study; vortex target; Gallium-68; Technetium-99m cyclotron; powder target; thermal study; vortex target; Gallium-68; Technetium-99m
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lange, G. Vortex Target: A New Design for a Powder-in-Gas Target for Large-Scale Radionuclide Production. Instruments 2019, 3, 24.

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