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Berlin 2024 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 9: Radiation Monitoring and Dosimetry

ST 9.1: Vortrag

Donnerstag, 21. März 2024, 15:00–15:15, PC 203

Neutron Dosimetry with Diamond SensorsClaus Maximilian Bäcker2, Christian Bäumer2, Kevin Kröninger1, Alina Landmann1, •Jennifer Schlüß1, Holger Stevens1, and Jens Weingarten11TU Dortmund University — 2West German Proton Therapy Center Essen

Neutron dosimetry is becoming increasingly relevant in proton therapy. From the neutrons released, conclusions can be drawn about the deposited energy in the body. However, the dosimetry is complicated because of their physical characteristics. One way to convert neutrons is using diamond sensors. The natural carbon isotope 12C captures fast neutrons (Ekin > 5 MeV). 12C produces alpha particles which can be detected in the diamond detector itself. The detection spectrum of diamond sensors is limited to fast neutrons. The goal is to make the detector sensitive to fast and thermal neutrons. To make the detector sensitive to thermal neutrons, an attempt is made to coat the detector with a converter material such as 6LiF. 6LiF has a large neutron absorption cross-section for thermal neutrons. The simulation platform Geant4 is used to test carbon capture reactions as a tool for further detector development. The results of the Geant4 simulation show that a diamond sensor coated with 6LiF is suitable for measuring thermal and fast neutrons. A first prototype of a diamond sensor is ready to measure energy spectrums in proton therapy. To characterize the detection of the whole spectrum, the diamond sensor will be tested in a later step with a converter.

Keywords: neutron dosimetry; diamond; proton therapy

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