FInal Report: First Principles Modeling of Mechanisms Underlying Scintillator Non-Proportionality

Aberg, Daniel¹  Sadigh, Babak¹  Zhou, Fei¹ 

[1] Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

关键词: PHOSPHORS;    SCINTILLATION COUNTERS;    COMPUTERIZED SIMULATION;    POINT DEFECTS;    DOPED MATERIALS;    QUANTUM MECHANICS;    POLARONS;    DIFFUSION;    SCINTILLATION QUENCHING;    RESOLUTION;    THERMODYNAMICS;    TRAPPING;   

DOI  :  10.2172/1252609
RP-ID  :  LLNL-TR--689786
PID  :  OSTI ID: 1252609
Others  :  TRN: US1601360

美国|英语

来源: SciTech Connect

【 摘 要 】

This final report presents work carried out on the project ???First Principles Modeling of Mechanisms Underlying Scintillator Non-Proportionality??? at Lawrence Livermore National Laboratory during 2013-2015. The scope of the work was to further the physical understanding of the microscopic mechanisms behind scintillator nonproportionality that effectively limits the achievable detector resolution. Thereby, crucial quantitative data for these processes as input to large-scale simulation codes has been provided. In particular, this project was divided into three tasks: (i) Quantum mechanical rates of non-radiative quenching, (ii) The thermodynamics of point defects and dopants, and (iii) Formation and migration of self-trapped polarons. The progress and results of each of these subtasks are detailed.