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DETERMINATION OF NEUTRON EFFECTIVE DOSES IN WHOLE BODY POINT SOURCE EXPOSURES.

Rosane Moreira Ribeiro1, Denison Souza-Santos1

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|December 19, 2017
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Summary
This summary is machine-generated.

This study calculates neutron dose conversion coefficients using GEANT4 simulations with ICRP phantoms. Results show good agreement with ICRP data, providing valuable coefficients for neutron point sources.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Computational Physics

Background:

  • Accurate neutron dose assessment is crucial for radiation protection.
  • Monte Carlo simulations are essential for modeling complex radiation transport in biological tissues.
  • The International Commission on Radiological Protection (ICRP) provides standardized voxel phantoms for dosimetry studies.

Purpose of the Study:

  • To determine fluence-to-effective dose conversion coefficients for neutron point sources.
  • To investigate neutron transport within the human body using GEANT4 simulations.
  • To provide conversion coefficients for specific Am-Be and Cf point sources.

Main Methods:

  • Utilized the GEANT4 toolkit for Monte Carlo simulations.
  • Employed ICRP Publication 110 voxel phantoms to represent the human body.
  • Benchmarked code using monoenergetic plane parallel neutron beams in antero-posterior (AP) geometry.
  • Compared organ absorbed dose conversion coefficients with ICRP Publication 116 data.

Main Results:

  • Demonstrated good agreement between simulated and ICRP-reported conversion coefficients within the studied energy range.
  • Calculated specific conversion coefficients for 241Am-Be and 252Cf point neutron sources.
  • Presented results for sources positioned 1 meter from the phantom in AP geometry.

Conclusions:

  • GEANT4 is a reliable tool for calculating neutron dose conversion coefficients.
  • The study provides validated conversion coefficients for neutron point sources relevant to radiation protection.
  • Findings support the use of ICRP voxel phantoms in neutron dosimetry research.