Validation of TOPAS MC for modelling the efficiency of an extended-range coaxial p-type HPGe detector

Lowie Brabants; Guilaume Lutter; Jan Paepen; Bram Vandoren; Brigitte Reniers; Wouter Schroeyers

doi:10.1016/j.apradiso.2021.109699

Validation of TOPAS MC for modelling the efficiency of an extended-range coaxial p-type HPGe detector

Appl Radiat Isot. 2021 Jul:173:109699. doi: 10.1016/j.apradiso.2021.109699. Epub 2021 Mar 29.

Authors

Lowie Brabants¹, Guilaume Lutter², Jan Paepen², Bram Vandoren³, Brigitte Reniers⁴, Wouter Schroeyers⁴

Affiliations

¹ Hasselt University, CMK, NuTeC, Nuclear Technology - Faculty of Engineering Technology, Agoralaan Building H, B- 3590, Diepenbeek, Belgium. Electronic address: lowie.brabants@uhasselt.be.
² EC-JRC, European Commission, Joint Research Centre, Retieseweg 111, B-2440, Geel, Belgium.
³ Hasselt University, CERG, Faculty of Engineering Technology, Agoralaan Building H, B- 3590, Diepenbeek, Belgium.
⁴ Hasselt University, CMK, NuTeC, Nuclear Technology - Faculty of Engineering Technology, Agoralaan Building H, B- 3590, Diepenbeek, Belgium.

PMID: 33827041
DOI: 10.1016/j.apradiso.2021.109699

Abstract

TOPAS MC software was used to model the efficiency of a coaxial p-type HPGe detector, type GX9023 from Canberra. The model was validated by comparing experimental efficiencies with efficiencies calculated by TOPAS MC simulations. Three different geometries of radionuclide sources, placed at different heights from the detector endcap, were used to validate the model. The imposed criteria of 5% relative difference was met for a range of radionuclides and gamma-ray energies. As a result, the created detector model with TOPAS MC was considered validated.

Keywords: High purity germanium detector; Monte Carlo; TOPAS MC.