1. Scintillation Materials Research Center and the Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, USA
2. Scintillation Materials Research Center and the Department of Nuclear Engineering, University of Tennessee, Knoxville, TN, USA
3. Radiation Monitoring Devices Inc., Watertown, MA, USA
4. Materials Science and Engineering Department, and the Department of Nuclear Engineering, Scintillation Materials Research Center, University of Tennessee, Knoxville, TN, USA