The LUX-ZEPLIN (LZ) experiment uses a 10-tonnes liquid xenon detector at the Sanford Underground Research Facility (SURF) in South Dakota to discover dark matter. Detector sensitivity can be improved by limiting background signals. I used Geant4 which is a particle simulation package to model potential sources of backgrounds. I found that small pockets of liquid xenon within the PTFE walls of the detector could generate enough light to be a meaningful background.