Göttingen 2025 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 5: Detector Physics

ST 5.3: Talk

Wednesday, April 2, 2025, 16:45–17:00, ZHG003

Studies for the development of a pixel detector for proton therapy — •Alina Hild, Kevin Kröninger, Hendrik Speiser, and Jens Weingarten — TU Dortmund University

For various applications in proton therapy, it is important to know the deposited energy and the linear energy transfer (LET), as the latter directly relates to the relative biological effectiveness (RBE) of the protons. Due to their good spatial resolution and radiation hardness, pixelated silicon detectors are a suitable choice for the measurement of these quantities.

This talk presents some ideas for determining specifications for a new monolithic active pixel sensor (MAPS) that is being developed specifically to meet the requirements of proton imaging. The detector should be capable of simultaneously measuring the LET and the deposited dose, while handling the high fluxes and relatively high deposited energies that occur.

In an initial study, measurements of the signal current in a silicon detector were taken at the Westdeutsche Protonen Zentrum (WPE) to evaluate the mean energy dose. The talk summarizes these measurements and provides an outlook on other required quantities.

Keywords: proton imaging; pixel detectors; proton therapy