Bismuth-207 for Liquid Argon Purity Monitoring in NP04-HD detector

The Deep Underground Neutrino Experiment (DUNE) is a U.S. flagship experiment aimed at unravelling the fundamental properties of neutrinos and their role in the universe. At the core of this research is the ProtoDUNE experiment, a precursor designed to validate technologies and methodologies for the full-scale DUNE Liquid Argon Time Projection Chamber (LArTPC) detector. In this presentation, I will discuss my shift work with the ProtoDUNE NP04 Horizontal Drift (NP04-HD) detector, highlighting my hands-on experience with detector operation and data acquisition. Additionally, I will present calibration studies using a Bi-207 source to monitor and calibrate the purity of Liquid Argon in NP04-HD. These efforts are important for improving data quality in future ProtoDUNE and DUNE runs and enabling more precise event detection.