Bonn 2020 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 7: Radiation Therapy and Detector Physics

ST 7.2: Talk

Thursday, April 2, 2020, 14:15–14:30, H-HS II

Comparative measurement of ¹²C(p,pn)¹¹C-cross section for particle therapy — •Claus Maximilian Bäcker^1,2,3,4, Wihan Adi⁵, Christian Bäumer^2,3,4, Marcel Gerhardt¹, Felix Horst^6,7, Kevin Kröninger¹, Christoph Schuy⁷, Beate Timmermann^2,3,4,8, Nico Verbeek^2,3,4, Jens Weingarten¹, and Jörg Wulff^2,3,4,6 — ¹TU Dortmund, Experimentelle Physik IV, 44227 Dortmund — ²Westdeutsches Protonentherapiezentrum Essen, 45122 Essen — ³Westdeutsches Tumorzentrum, 45122 Essen — ⁴Universitätsklinikum Essen, 45122 Essen — ⁵II. Physikalisches Institut, Justus-Liebig-Universität, 35392 Giessen — ⁶Institut für Medizinische Physik und Strahlenschutz, Technische Hochschule Mittelhessen, 35390 Gießen — ⁷GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt — ⁸Universitätsklinikum Essen, Klinik für Partikeltherapie, 45122 Essen

For PET imaging as a range verification method in proton therapy, an accurate knowledge of the activation cross sections is required to determine the expected β⁺ activity distribution.

For the ¹²C(p,pn)¹¹C-reaction, the measured cross sections accumulate around two excitation functions, which are about 15% apart. This difference exists also in the recent measurements from Essen / Dortmund and Giessen / Darmstadt. By comparison of both experimental studies and cross check of parameters, like irradiation technique or target size and material, the reason for the difference is investigated and several parameters have already been successfully excluded as a reason for this difference. In this talk, the current results will be presented.