Erlangen 2026 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 3: Detectors for Medical Applications

ST 3.6: Vortrag

Mittwoch, 18. März 2026, 15:00–15:15, KH 01.013

Dosimetry of high intensity electron beams for FLASH radiotherapy using Dosepix detectors and nitrogen fluorescence — •Florian Beißer for the NitroFLASH collaboration — ECAP, FAU Erlangen-Nürnberg, Erlangen, Germany

FLASH radiation therapy with high-intensity electrons, where the full dose is delivered in a very short time frame, has been proven to be a very promising evolution of radiation therapy. Yet there currently exist no established methods for online dosimetry and position determination as the established detector concepts, such as monitor chambers, saturate in the high intensity beams. We here explore two possible technologies: the detection of stray electrons using Dosepix solid-state detectors and nitrogen fluorescence in air. The response of the Dosepix detectors showed clear monotonous trends with respect to distance and bunch charge, enabling the determination of the beam position and intensity from that data. Additionally, a UV camera was mounted perpendicular to the beam axis to detect the emitted nitrogen fluorescence photons as the beam traverses air, thus imaging the electron beam and reconstructing its full position and width. Although a fluorescence signal of the beam could be detected with the UV-camera, the observed intensity was too low to meaningfully reconstruct beam parameters for ARES. However, much higher intensities are expected for the FLASHlab at PITZ.

Keywords: FLASH therapy; Beam Monitoring; Dosepix; Fluorescence; Electrons