Abstract:
This presentation discusses the radiation effects on nanostructures (quantum dots) after exposure to ionizing radiation by observing changes in luminescence. The goal of our research is to evaluate quantum dots in solution for radiation hardness, specifically total ionizing dose (TID). Various compositions of commercially available quantum dots are examined, and a high activity 137Cs source is used to induce ionization damage in quantum dot samples. Laser-induced photoluminescence spectroscopy, and Xe bulb-induced fluorescence spectroscopy are used to measure quantum dot luminescence. We observe significant changes to the luminescence of irradiated quantum dots and find that changes are based on quantum dot composition. We performed TID up to 100 kR. We explore Graphene, Perovskite, and CdTe quantum dots in our study, with fluorescence spectroscopy as the most reliable measurement technique.

Bio:
Edward Cazalas, Ph.D., Nuclear Engineering Program at University of Utah. Prof. Cazalas earned his Ph.D. from Penn State in Nuclear Engineering. He since worked at RAND Corporation and the U.S. Air Force Institute of Technology. His research is in the areas of radiation detection, dosimetry, and radiation effects on electronics and materials. He has been at the University of Utah since 2018 and has served as faculty advisor to its ANS chapter since 2020.

The NERS Colloquia Series invites leading researchers, industry experts, and thought leaders from across the nuclear engineering and radiological sciences community to share their insights with students, faculty, and guests. Covering a wide range of topics—from cutting-edge research and emerging technologies to policy, education, and professional development—the weekly talks offer an opportunity to explore current issues and innovations shaping the future of the field.