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

Technical Report · Thu Jan 01 04:00:00 EST 2015

DOI:https://doi.org/10.2172/1252609· OSTI ID:1252609

Aberg, Daniel ^[1]; Sadigh, Babak ^[1]; Zhou, Fei ^[1]

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

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.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-07NA27344
• OSTI ID: 1252609
• Report Number(s): LLNL-TR--689786
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COMPUTERIZED SIMULATION
DIFFUSION
DOPED MATERIALS
PHOSPHORS
POINT DEFECTS
POLARONS
QUANTUM MECHANICS
RESOLUTION
SCINTILLATION COUNTERS
SCINTILLATION QUENCHING
THERMODYNAMICS
TRAPPING