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Related Experiment Video

Updated: Apr 30, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
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PHITS code Monte Carlo simulation of a gamma chamber 5000.

Okky Agassy Firmansyah1,2, Budhy Kurniawan3, Marta Walo4

  • 1Department of Physics, Faculty of Mathematics and Natural Science, University of Indonesia, West Java, 16424, Indonesia.

Radiation and Environmental Biophysics
|June 12, 2025
PubMed
Summary

Monte Carlo simulation using PHITS software accurately mapped dose distribution in the Gamma Chamber 5000 irradiator. This validated method, combining simulation and alanine dosimetry, ensures precise dose calibration for radiation processing facilities.

Keywords:
Alanine dosimeterDose mappingGamma irradiatorMonte CarloPHITS

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Area of Science:

  • Nuclear Engineering
  • Medical Physics
  • Radiation Dosimetry

Background:

  • The Gamma Chamber 5000 (GC-5000) is a compact dry storage irradiator suitable for sample irradiation and dosimeter calibration.
  • Optimizing GC-5000 calibration services necessitates a detailed understanding of dose distribution within its sample chamber.
  • Accurate dose mapping is crucial for reliable radiation processing applications.

Purpose of the Study:

  • To demonstrate the applicability of Monte Carlo (MC) simulation using the PHITS software for dose distribution determination in the GC-5000 irradiator.
  • To validate MC simulation results through experimental measurements using alanine dosimetry.
  • To establish a reliable methodology for dose mapping in compact irradiators.

Main Methods:

  • Monte Carlo (MC) simulation with PHITS software was employed to model the GC-5000 irradiator, including its 44 Co-60 sources.
  • Alanine dosimeters were used for experimental dose mapping at five points within a polymethyl methacrylate (PMMA) phantom.
  • Both the PMMA phantom and alanine dosimeters were simulated using PHITS for direct comparison.

Main Results:

  • MC simulation results showed good agreement with experimental alanine dosimetry measurements.
  • Relative differences between simulation and experiment ranged from 0.7% to 7.0%.
  • The best agreement was observed at the center of the PMMA phantom.

Conclusions:

  • MC simulation using PHITS is a validated and practical method for precise dose mapping in the GC-5000 irradiator.
  • The integrated approach of MC modeling and alanine dosimetry provides a robust framework for dose calibration.
  • This methodology can be extended to optimize other industrial radiation processing facilities and compact irradiators.