Technical Note: Standalone application to generate custom reflectance Look-Up Table for advanced optical Monte Carlo simulation in GATE/Geant4

Area of Science:

• Physics
• Computer Science
• Engineering

Background:

• Accurate modeling of radiation detectors is crucial for performance optimization using Monte Carlo simulations.
• Simulating light transport in scintillators and light collection by photodetectors requires high fidelity.

Purpose of the Study:

• To implement a validated crystal reflectance model in a standalone, open-source application.
• To enable researchers to generate customized crystal reflectance look-up-tables (LUTs) for optical Monte Carlo simulations.

Main Methods:

• Developed the LUTDavisModel application, installable on Windows, macOS, and Linux.
• The application allows generation of LUTs from various surface types, scintillators, and coupling media, including custom options.
• Features include computation of LUTs with custom reflectors and coupling thickness, mixture of coupling media, and plotting of precomputed LUTs.

Main Results:

• LUTs can be generated within minutes to hours, depending on surface complexity, sampling, and computational resources.
• Increased computational time is observed for rough surfaces and thick coupling media due to extensive photon tracking.

Conclusions:

• A user-friendly, standalone application (LUTDavisModel) has been developed for generating LUTs for GATE Monte Carlo simulations.
• The application is easily downloadable, installable, and usable.
• Future work includes database expansion, computational time reduction via parallelization, and inclusion of Cerenkov photon transport simulation.