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Photon and Neutron Dose Estimation Using Monte Carlo Simulation in TrueBeam's Room.

Soai Dang Quoc1, Toshioh Fujibuchi2, Hiroyuki Arakawa2

  • 1Department of Health Sciences, Division of Medical Quantum Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.

Journal of Medical Physics
|November 11, 2024
PubMed
Summary

Neutron dose equivalents around the TrueBeam 10 MV photon chamber were simulated and measured. Smaller beam sizes (0.5 cm x 0.5 cm) resulted in higher neutron ambient dose equivalents compared to larger fields.

Keywords:
Ambient dose equivalentMonte Carloparticle and heavy ion transport code systemphotoneutronradiotherapy

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiation Detection and Measurement

Background:

  • High-energy photon beams in radiation therapy can generate secondary neutrons.
  • Accurate assessment of neutron ambient dose equivalent is crucial for radiation safety in the vicinity of medical linear accelerators.

Purpose of the Study:

  • To investigate the distribution of neutron ambient dose equivalent within the TrueBeam 10 MV photon chamber.
  • To compare simulated neutron dose equivalents with measured values for different field sizes.

Main Methods:

  • Simulations were performed using the Particle and Heavy Ion Transport Code System (PHITS) and JENDL-5.0.
  • Neutron ambient dose equivalent was measured using CR-39 detectors.
  • Comparisons were made for 10 MV photon beams with field sizes of 20 cm x 20 cm and 0.5 cm x 0.5 cm, at 5000 monitor units.

Main Results:

  • Neutron ambient dose equivalents for the 0.5 cm x 0.5 cm field size were 4% to 30% higher than those for the 20 cm x 20 cm field size, particularly out of the primary beam field.
  • The differences between simulated and measured neutron ambient dose equivalents were less than 20% at all measured points.

Conclusions:

  • The PHITS and JENDL-5.0 simulation accurately predicted neutron ambient dose equivalents.
  • The simulation results are in good agreement with experimental measurements, validating the methodology for assessing neutron dose in TrueBeam photon therapy.