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The radiation environment in low-Earth orbit

G D Badhwar1

  • 1NASA Johnson Space Center, Houston, Texas 77058-3696, USA.

Radiation Research
|November 14, 1997
PubMed
Summary

The space radiation environment in low-Earth orbit includes cosmic rays and trapped particles. This study reviews radiation sources and estimates dose rates for the International Space Station using data from the Mir orbital station.

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Area of Science:

  • Space physics
  • Astrobiology
  • Radiation biology

Background:

  • Low-Earth orbit presents a complex radiation environment.
  • This environment comprises galactic cosmic radiation, trapped particles, and secondary particles.
  • Solar energetic particles can also impact spacecraft.

Purpose of the Study:

  • To review the primary sources of charged-particle radiation exposure for manned spacecraft.
  • To provide dose rate estimates for the International Space Station (ISS).
  • To base these estimates on data from the Mir orbital station.

Main Methods:

  • Review of scientific literature on space radiation sources.
  • Analysis of radiation measurements from the Mir orbital station.
  • Extrapolation of Mir data to estimate ISS radiation dose rates.

Main Results:

  • Identification of key charged-particle radiation contributors in low-Earth orbit.
  • Estimation of expected radiation dose rates for the ISS.
  • Validation of dose rate estimates using historical data.

Conclusions:

  • Understanding the space radiation environment is crucial for astronaut safety.
  • The ISS will experience a significant radiation dose from various sources.
  • Data from previous missions like Mir are valuable for predicting future radiation exposure.
Keywords:
NASA Center JSCNASA Discipline Radiation Health

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