1. Scintillation Materials Research Center, University of Tennessee, Knoxville, Tennessee 37996, United States
2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
3. Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, Tennessee 37996, United States
4. Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States