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A method for estimating the bremsstrahlung dose into spacecraft from incident electrons
1Research Center of Spacecraft Radiation Safety, Moscow, Russia.
Radiation Measurements
|January 1, 1994
Summary
An approximate method estimates radiation dose inside spacecraft from electron-induced bremsstrahlung. Homogenizing spacecraft material yields results within 10% of Monte Carlo simulations, but underestimates dose compared to inhomogeneous models.
Area of Science:
- Space physics
- Radiation shielding
- Computational physics
Background:
- Spacecraft are exposed to energetic electrons in radiation belts.
- Bremsstrahlung radiation from these electrons poses a dose hazard inside spacecraft.
- Accurate dose assessment is critical for mission safety and hardware integrity.
Purpose of the Study:
- To develop an approximate procedure for calculating bremsstrahlung dose within spacecraft.
- To validate the proposed method against detailed simulations.
- To investigate the impact of material distribution on dose estimation.
Main Methods:
- Proposed an approximate calculation procedure for bremsstrahlung dose.
- Homogenized spacecraft material for simplified dose estimation.
- Compared results with three-dimensional Monte Carlo simulations.
- Analyzed dose differences between homogeneous and inhomogeneous material distributions.
Main Results:
- The approximate procedure, with homogenized material, agrees within 10% of Monte Carlo calculations.
- Estimating dose using a homogeneous slab can underestimate the absorbed dose by up to five times.
- Inhomogeneous material distribution significantly increases the calculated absorbed dose.
Conclusions:
- The proposed approximate method offers a computationally efficient way to estimate radiation dose.
- Material inhomogeneity is a crucial factor in accurate spacecraft radiation dose assessment.
- Further refinement of approximate methods considering material distribution is warranted for precise dose prediction.