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Radiation dose and shielding for the Space Station
1National Aeronautics and Space Administration, Office of Space Station, Washington, DC 20546.
Acta Astronautica
|January 1, 1988
Summary
Future magnetic field extrapolation significantly impacts Space Station radiation dose predictions. For low Earth orbit missions, current shielding is adequate for 90-day stays, but longer durations require countermeasures.
Area of Science:
- Space Science
- Radiation Physics
- Astrobiology
Background:
- Accurate radiation dose prediction is critical for crew safety on space missions.
- The Earth's magnetic field and residual atmosphere significantly influence radiation exposure.
- Previous dose calculations for the Space Station have shown variability based on modeling assumptions.
Purpose of the Study:
- To investigate the impact of magnetic field model extrapolation on Space Station radiation dose predictions.
- To evaluate the role of the residual atmosphere in radiation attenuation.
- To compare dosimetry results from Shuttle flights with computed predictions.
Main Methods:
- Analysis of dose prediction models for the Space Station.
- Examination of the influence of magnetic field extrapolation on dose calculations.
- Assessment of radiation attenuation by the residual atmospheric layer below 1000 km.
- Comparison of computed dosimetry with data from Shuttle flights.
Main Results:
- Extrapolating the magnetic field model into the future introduces significant differences in dose predictions.
- The residual atmospheric layer below 1000 km plays a crucial role in radiation attenuation.
- Shuttle flight dosimetry results align with computed predictions when specific modeling parameters are used.
- Dose predictions for 90-day Space Station missions at altitudes below 500 km and low inclination are within current limits for nominal shielding.
Conclusions:
- It is recommended to avoid future extrapolation of the magnetic field model in current Space Station dose calculations.
- A model adjustment is proposed to replace arbitrary extrapolation procedures.
- Longer mission durations (≥1 year) at low Earth orbit will necessitate radiation countermeasures, such as increased shielding.
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