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Radiation dose from reentrant electrons.

G D Badhwar1, J Watts, T E Cleghorn

  • 1NASA Lyndon B. Johnson Space Center, SN, 2101 NASA Road 1 Houston, TX 77058-3696, USA. gautam.d.badhwar@jsc.nasa.gov

Radiation Measurements
|February 22, 2002
PubMed
Summary
This summary is machine-generated.

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Reentrant electrons, previously ignored in space radiation exposure assessments, significantly increase crew radiation dose during spacewalks (extravehicular activity). Even with added shielding, these high-energy electrons pose a substantial risk to blood-forming organs.

Area of Science:

  • Space radiation physics
  • Astrobiology and space exploration

Background:

  • Crew exposure during extravehicular activity (EVA) is a critical concern in space missions.
  • The contribution of reentrant electrons to radiation dose has been historically underestimated.

Purpose of the Study:

  • To quantify the dose contribution of reentrant electrons to crew exposures during EVA.
  • To evaluate the effectiveness of shielding against reentrant electron radiation.

Main Methods:

  • Utilized measured reentrant electron energy spectra for dose calculations.
  • Assessed dose contribution to blood-forming organs (BFO).
  • Analyzed dose-depth response to shielding.

Main Results:

  • Reentrant electrons contribute over 10 times more dose to BFO than trapped electrons.
Keywords:
NASA Center JSCNASA Discipline Radiation Health

Related Experiment Videos

  • The energy spectrum of reentrant electrons extends to several GeV, far exceeding trapped electrons.
  • Dose-depth response is a slowly changing function, limiting shielding effectiveness.

    • Conclusions:

    • Reentrant electrons are a significant, previously neglected, source of radiation dose during EVA.
    • Current shielding strategies may be insufficient to mitigate the risks posed by reentrant electrons.
    • Further research into advanced shielding or operational strategies is warranted to protect astronauts.