Peter Dimpfl successfully defended his thesis entitled “Monte Carlo Simulation of Thallium-Bromide Semiconductor Detector for Range Verification of a Carbon Ion Radiotherapy Beam Through Prompt Gamma-Ray Detection” on June 17, 2022. In this study, Monte Carlo simulations were completed to evaluate TlBr performance in the detection of prompt gamma rays generated from the irradiation of a Polymethyl methacrylate (PMMA) phantom with carbon ions. TlBr was able to detect the prompt Gamma-Ray profiles of three different materials (cortical bone, adipose tissue, PMMA) with correlation to actual simulated Bragg peaks. The committee includes Dr. Yu Kuang (chair), Dr. Zaijing Sun, Dr. Steen Madsen, and Dr. Hui Zhao.