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Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Comparison of electron scattering algorithms in Geant4.

D Sawkey¹, M Constantin, M Svatos

¹Varian Medical Systems, 3120 Hansen Way, Palo Alto, CA 94304, USA.

Physics in Medicine and Biology

|May 11, 2012

Summary

This summary is machine-generated.

The Urban scattering models in Geant4 (Geant4) simulations closely matched experimental electron scattering data. However, simulations consistently showed narrower distributions than measurements, indicating a potential systematic difference in electron transport modeling.

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Area of Science:

Medical Physics
Computational Physics
Particle Physics

Background:

Accurate electron scattering simulations are crucial for applications in radiation therapy and detector design.
Geant4 is a widely used toolkit for simulating particle interactions in matter.
Benchmarking Geant4 algorithms against experimental data is essential for validating simulation accuracy.

Purpose of the Study:

To benchmark electron scattering algorithms in Geant4 versions 9.4 and 9.5.
To compare simulation results with experimental measurements for various materials and energies.
To evaluate the performance of different scattering models within Geant4.

Main Methods:

Electron scattering distributions were simulated using Geant4 versions 9.4 and 9.5.
Simulations employed Urban (versions 93 and 95), Goudsmit-Saunderson, and single scattering models.
Results were compared against experimental data at 13 and 20 MeV for low, intermediate, and high atomic number materials.

Main Results:

The Urban93 and Urban95 models with a large step size limit closely matched experimental results.
Urban model simulations produced distributions up to 6% narrower than experimental data, consistent with EGSnrc simulations.
The Goudsmit-Saunderson model showed significant deviations, up to 15% in Geant4 v9.5 and 45% in v9.4.

Conclusions:

The Urban models, particularly with a large step size limit, provide the most accurate electron scattering simulations in Geant4 for the tested conditions.
A systematic difference between simulated and measured electron scattering distributions persists, suggesting areas for model improvement.
The Goudsmit-Saunderson model requires further refinement for accurate electron transport simulations in Geant4.