Würzburg 2018 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 2: Detector Physics

ST 2.5: Talk

Tuesday, March 20, 2018, 17:45–18:00, Phys-HS P

Photon Dose Equivalent Measurements with Timepix3 Detector — •Jürgen Roth¹, Oliver Hupe¹, Hayo Zutz¹, Annette Röttger¹, Thilo Michel², and Patrick Hufschmidt² — ¹Physikalisch-Technische Bundesanstalt (PTB); Bundesallee 100; 38116 Braunschweig — ²Erlangen Centre for Astroparticle Physics ECAP Friedrich-Alexander-Universität Erlangen-Nürnberg Erwin-Rommel-Str. 1 91058 Erlangen

The use of pixel detectors is a very promising approach for dosimetry in pulsed photon radiation fields. In these challenging fields, the pulse duration and the pulse dose rate range over several orders of magnitude. The scalable sensor area of active pixel detectors has the great advantage that each pixel acts as a separate detector. At low dose rates, aggregating the signals from all individual pixels improves counting statistics, thus also improving the uncertainty of dose measurement. At high dose rates, due to the small sensor area of a single pixel, the count rate is kept low and therefore the dead time and the likelihood of pile-ups is reduced. This contribution presents the first measurements in terms of ambient dose equivalent H*(10) performed using a TIMEPIX 3 detector with 256 x 256 pixels in PTB’s reference fields. The comparability of the results with the DOSEPIX detector, which uses the same sensor material of 300 µm thick silicon semiconductor but a different pixel layout, are discussed as well.