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Related Experiment Videos

Particle directionality and trapped proton fluences on LDEF.

N Nefedov1, I Csige, E V Benton

  • 1Physics Research Laboratory, University of San Francisco, CA 94117-1080, USA.

Radiation Measurements
|November 1, 1996
PubMed
Summary

Space radiation directionality is key for spacecraft shielding and astronaut safety in low Earth orbit. This study measured particle directionality using plastic nuclear track detectors, revealing anisotropy in trapped protons.

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Area of Science:

  • Space physics
  • Radiation detection
  • Astrophysics

Background:

  • Space radiation, including galactic cosmic rays (GCR) and trapped protons, poses risks to spacecraft and astronauts.
  • Understanding particle directionality is crucial for effective shielding and accurate dosimetry in low Earth orbit (LEO).

Purpose of the Study:

  • To measure the directionality of incident space radiation, specifically GCR and trapped protons, using data from the LDEF satellite.
  • To analyze the anisotropy of trapped protons and compare measured eastward-directed proton fluences with model calculations.

Main Methods:

  • Utilized plastic nuclear track detectors (PNTD) from the P0006 west-side experiment on the Long Duration Exposure Facility (LDEF).
  • Employed a thick detector stack to measure particle directionality and selected eastward-directed trapped protons based on their range within the PNTDs.
Keywords:
NASA Discipline Radiation HealthNon-NASA Center

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Main Results:

  • Observed anisotropy in trapped protons, with maximum intensity detected for protons arriving from the west.
  • Successfully measured the fluences of eastward-directed trapped protons by analyzing particle ranges in the PNTDs.

Conclusions:

  • The directionality of space radiation, particularly trapped protons, significantly impacts LEO missions.
  • Measured proton fluences provide valuable data for validating and refining space radiation models.