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Neutron shielding for a new projected proton therapy facility: A Geant4 simulation study.

Francesco Cadini1, David Bolst2, Susanna Guatelli3

  • 1Politecnico di Milano, Dipartimento di Energia, Via La Masa 34, I-20156 Milano, Italy; Centre for Medical Radiation Physics, University of Wollongong, NSW, Australia.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|December 28, 2016
PubMed
Summary

This study used Geant4 simulations to assess neutron radiation in a new proton therapy facility. Results confirm the facility

Keywords:
Geant4Neutron shieldingProton therapy facilityRadiation protection

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Area of Science:

  • Medical Physics
  • Radiation Protection
  • Computational Science

Background:

  • Proton therapy facilities generate secondary neutron fields.
  • Accurate assessment of neutron radiation is crucial for safety.
  • New facility designs require thorough radiation shielding verification.

Purpose of the Study:

  • To calculate ambient dose equivalents from secondary neutrons in a new proton therapy facility.
  • To verify neutron shielding effectiveness and ensure compliance with safety regulations.
  • To provide a benchmark for future proton therapy facility shielding analyses.

Main Methods:

  • Utilized the Geant4 simulation toolkit to model the facility geometry based on CAD designs.
  • Simulated 250 MeV proton beams at various angles and a fixed beam.
  • Calculated ambient dose equivalents in multiple locations inside and outside the facility.

Main Results:

  • Simulation results for ambient dose equivalent were found to be reasonable when compared to existing facilities.
  • Calculated dose rates are below Australian regulatory limits, with maximums of 7.9 mSv/y in control areas and 0.13 mSv/y outside.
  • The analysis confirmed the facility's viability from a radiation protection perspective.

Conclusions:

  • The projected proton therapy facility meets radioprotection standards, ensuring safety for staff and the public.
  • Geant4 simulations provide a reliable method for neutron shielding verification in proton therapy facilities.
  • This study serves as a valuable reference for international validation and future facility designs.