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Preliminary total dose measurements on LDEF.

G Reitz1

  • 1DLR, Institute for Aerospace Medicine, Biophysics Division, Köln, Germany.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1992
PubMed
Summary

Space radiation

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Area of Science:

  • Space science
  • Radiation biology
  • Dosimetry

Background:

  • The Long Duration Exposure Facility (LDEF) mission carried 57 science and technology experiments, including the Free Flyer Biostack experiment.
  • The Biostack experiment involved 20 stacks of radiation detectors and biological samples exposed in Earth orbit for nearly six years.

Purpose of the Study:

  • To investigate the biological effectiveness of cosmic radiation's heavy ions on biological systems.
  • To determine the spectral composition of the radiation field and total radiation dose in the LDEF orbit.
  • To provide crucial data for long-term spaceflight radiation exposure, relevant to Space Station Freedom.

Main Methods:

  • Utilized Lithium fluoride thermoluminescence dosimeters (TLD) with varying isotopic compositions at different depths within the Biostacks.
  • Analyzed TLD data to measure absorbed dose rates and thermal neutron fluence.
  • Mounted Biostacks in two distinct locations on the LDEF structure.

Main Results:

  • Preliminary analysis indicated maximum absorbed dose rates of 2.24 mGy/day (0.7 g cm-2 shielding) and 1.17 mGy/day (12 g cm-2 shielding).
  • Determined a thermal neutron fluence of 1.7 n cm-2 s-1.
  • Established dose rates and spectral composition data for the LDEF orbit.

Conclusions:

  • The experiment provides valuable, scarce dosimetric data for long-term spaceflight radiation exposure.
  • Findings are critical for understanding space radiation's biological effectiveness in orbits similar to Space Station Freedom.
  • The study highlights the need for more research into long-duration space radiation effects.

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