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Enhanced accuracy in radiation dose estimation for astronauts using mesh-type reference computational phantoms.

Vivek Kaushik1, Sabyasachi Paul1, Sunder Sahayanathan2

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Summary
This summary is machine-generated.

Advanced computational phantoms improve astronaut radiation dose estimation for deep space missions. Mesh-type Reference Computational Phantoms (MRCPs) offer more accurate calculations for thin organs, enhancing radiation protection strategies.

Keywords:
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Area of Science:

  • Space exploration
  • Radiation physics
  • Computational biology

Background:

  • Accurate astronaut radiation dose estimation is crucial for deep space missions.
  • Traditional methods may overestimate biological impact on thin-layered organs.

Purpose of the Study:

  • To enhance radiation dose and quality factor calculations using Mesh-type Reference Computational Phantoms (MRCPs).
  • To compare MRCPs with Voxel-type Reference Computational Phantoms (VRCPs) for various radiation types.

Main Methods:

  • Utilized Geant4 simulation toolkit with MRCPs.
  • Calculated dose conversion coefficients and quality factors for protons, alpha, carbon, magnesium, and iron ions.
  • Employed both ICRP and NASA radiation quality factor models.

Main Results:

  • MRCPs showed improved dose estimations for thin organs like skin (up to 30% lower absorbed dose below 10 MeV/u).
  • MRCPs yielded 10-20% lower quality factors for heavy ions at 10-100 MeV/u.
  • Body-mean quality factor for protons was reduced by 15% at low energies (<100 MeV/u) using MRCPs.

Conclusions:

  • MRCPs provide more accurate radiation dose and quality factor calculations compared to VRCPs.
  • Improved accuracy supports better mission planning, shielding, and astronaut radiation protection.
  • This advancement is vital for the safety of future deep space exploration.