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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 7: Applied Physics with Accelerators

AKBP 7.2: Talk

Wednesday, March 20, 2024, 09:45–10:00, E 020

Proton Beam Based Production of a Positron Emitter by Exploiting the ²⁷Al(p,x)²²Na Reaction — •Lisa-Marie Krug¹, Leon Chryssos¹, Jürgen Bundesmann², Alina Dittwald², Georgios Kourkafas², Andrea Denker², and Christoph Hugenschmidt¹ — ¹Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Protonen für die Therapie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

Compact setups for defect spectroscopy based on positron annihilation conventionally comprise a β⁺ emitter as positron source. We produced ²²Na sources by irradiating aluminum targets with a 68 MeV proton beam available at the cyclotron at the Helmholtz-Zentrum Berlin (HZB). The design of the target allowed the production of multiple positron sources at once as well as the analysis of the depth dependent activity of ²²Na, which was found to be in agreement with the simulated depth profile. In total a ²²Na activity of 140(23) kBq was produced, which is spread over 50 individual Al discs whereby the highest activity achieved amounts to 4.62(23) kBq. Using the activated Al discs as positron emitters intrinsically avoids wet chemical processes. The production of stronger sources is desired for positron annihilation spectroscopy experiments can easily be achieved by irradiating the target for a longer period of time. Other radionuclides among ⁷Be, ⁴⁸Sc, ⁵⁴Mn and ⁵⁶Co were produced with a total activity of 70(5) kBq, but can be avoided aside from ⁷Be by using aluminum of a higher purity.

Keywords: 22-Na; Radionuclide Production; Positrons; Proton Beam; Cyclotron