Köln 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 23: Poster

HK 23.17: Poster

Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik

Assessing Ge-Detector Efficiency in Cylindrical Geometries Using GEANT4: Correlation with Radioactive Surface Standard Measurements — •Diandra Richter, Jonny Birkhan, and Norbert Pietralla — IKP, Darmstadt, Germany

Clearence measurements for radiation protection purposes are often done by γ-spectrometric analysis of volumetric environmental samples. This requires calibration of the detection efficiency of the measurement setup using appropriate calibration sources. These sources are generally prepared through the so-called spiking method, in which material is impregnated with a multi-element solution. This method is time-consuming and expensive. An alternative calibration method involves the preparation of a surface standard, made from a circular filter paper sandwiched between two foils [1]. This standard is typically used to estimate the efficiencies for filled Petri dishes, accounting for sample attenuation. Measurements are conducted with the foil placed either between the detector and the sample or directly on the sample. This foil method provides results that are compatible with the spiking method, but its application is limited to flat samples, like for example Petri dishes. In this study, GEANT4 simulations were used to investigate how many stacked Petri dishes can still produce sufficiently accurate results with the foil method compared to the spiking method. Clearence measurements would be simplified, because more material could be measured with the foil method simultaneously. [1] Vahlbruch, Jan-Willem: Dissertation, Uni Hannover, 2004.

Keywords: Efficiency, MC-simulation, foil method