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Astronaut dose coefficients calculated using GEANT4 and comparison with ICRP123.

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  • 1Particle Physics Research Center, Shandong Institute of Advanced Technology, 1501 Panlong Road, Jinan, 250103, Shandong, China.

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Calculating astronaut radiation dose requires accurate fluence-to-dose conversion coefficients. This study reveals that GEANT4 simulations yield higher dose equivalents than ICRP123, highlighting uncertainties from physics interaction models.

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Area of Science:

  • Space radiation physics
  • Radiation dosimetry
  • Computational physics

Background:

  • Accurate astronaut radiation dose calculation is crucial for space missions.
  • International Commission on Radiological Protection Publication 123 (ICRP123) provides widely used conversion coefficients.
  • Understanding uncertainties in these coefficients is vital for precise dose assessment.

Purpose of the Study:

  • To systematically study unshielded dose coefficients using GEANT4 simulations.
  • To evaluate the impact of different physics lists on dose calculations.
  • To compare simulation results with existing ICRP123 data.

Main Methods:

  • Utilized GEANT4 Monte Carlo toolkit and ICRP Publication 110 human voxel phantoms.
  • Employed four GEANT4 physics lists with variations in electromagnetic and hadronic interactions.
  • Calculated absorbed dose and dose equivalent coefficients for individual cosmic nuclei (Z=1-28) across a wide energy range (1 MeV/n to 100 GeV/n).

Main Results:

  • Effective dose equivalent rates in free space at 1 AU were calculated.
  • Results from the four physics lists agreed within 5%.
  • On average, calculated dose equivalents were higher than ICRP123 results by 15% (ICRP60 quality factor) and 17% (NASA quality factor).

Conclusions:

  • GEANT4 simulations provide dose coefficients that differ systematically from ICRP123.
  • Physics interaction models introduce significant uncertainty in astronaut radiation exposure calculations.
  • Further research into these models is needed for improved radiation protection in space.