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Hiroshi Watabe1, Tatsuhiko Sato2, Kwan Ngok Yu3

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This study enhances DynamicMC software for improved radiation dose modeling with the Particle and Heavy Ion Transport code System (PHITS). New features enable flexible phantom movement and dose calculations for research and teaching in nuclear radiation physics.

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Area of Science:

  • Nuclear radiation physics
  • Computational physics
  • Medical physics

Background:

  • DynamicMC software was previously developed for modeling phantom movement in radiation fields.
  • Current methods allow dose distribution calculations for mono-energetic sources via a graphical user interface.

Purpose of the Study:

  • To extend DynamicMC for integration with the Particle and Heavy Ion Transport code System (PHITS).
  • To enhance flexibility for dynamic movement of anthropomorphic phantoms in radiation simulations.
  • To reduce computational cost and complexity in radiation transport modeling.

Main Methods:

  • Implemented four new functions in DynamicMC: arbitrary radioisotope energy spectrum sources, organ-specific absorbed dose calculations, automatic dose averaging along phantom paths, and user-defined slab shielding.
  • Utilized PHITS-specific radioisotope-source and sumtally functions for enhanced capabilities.
  • Integrated DynamicMC with PHITS for advanced radiation transport simulations.

Main Results:

  • Successfully extended DynamicMC to work with PHITS, offering greater flexibility for anthropomorphic phantom movement.
  • Enabled the simulation of various radiation sources, including those with energy spectra from radioisotopes.
  • Developed functionalities for calculating absorbed doses in specific organs and averaging them along phantom movement paths.
  • Introduced the capability to generate user-defined slab shielding materials.

Conclusions:

  • The enhanced DynamicMC, in conjunction with PHITS, significantly improves radiation dose modeling capabilities.
  • The developed open-source tools offer reduced computational cost and complexity.
  • These advancements are expected to benefit the nuclear radiation physics community for research and educational purposes.