Calibration and Characterization of Muon Veto Panel

High-purity germanium (HPGe) detectors are vital instruments for material assay in rare-event search experiments. Using gamma spectroscopy, they enable precise measurements of material radioactivity, allowing the selection of ultra-pure components for detector construction. In our research laboratory at UCLA, we are commissioning an HPGe detector to contribute to the assay campaign for next-generation (G3) dark matter detectors. Owing to our above-ground location, the system is sensitive to cosmic-ray muons. To identify and reject muon-induced events, we employ five plastic scintillator panels (so-called muon veto panels) surrounding the HPGe detector. I will present the calibration and characterization of these muon veto panels, along with comparisons to Geant4 Monte Carlo simulations and established literature.