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Related Experiment Videos

Study with a multi-threshold HZE-particle dosimeter using plastic detectors.

R Beaujean1, W Enge, W Herrmann

  • 1Institut fur reine und angewandte Kernphysik der Christian Albrechts Universitat, Kiel, FRG.

Life Sciences and Space Research
|January 1, 1976
PubMed
Summary
This summary is machine-generated.

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Cosmic radiation exposure during Apollo missions was studied using plastic detectors. Heavy ions were measured, revealing a power-law distribution, with most originating from high-atomic-number particles.

Area of Science:

  • Space Science and Astrophysics
  • Radiation Physics
  • Materials Science

Background:

  • The Biostack experiment exposed detector units to cosmic radiation during Apollo 16 and 17 missions.
  • Understanding cosmic radiation's impact is crucial for space exploration safety and instrumentation.

Purpose of the Study:

  • To measure and characterize the integral energy loss spectrum of heavy ions.
  • To analyze the distribution of cosmic radiation particles based on their restricted energy loss (REL).

Main Methods:

  • Utilized plastic detector sheets (cellulose nitrate and Lexan polycarbonate) for recording heavy ions.
  • Conducted measurements under varying absorber thicknesses (4 g cm⁻² and 20 g cm⁻²).
  • Determined the integral energy loss spectrum and particle fluence.

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Main Results:

  • The number of particles per cm² with restricted energy loss (REL) greater than REL0 followed a power law: a * REL(b), with b = -2.18 ± 0.1.
  • The coefficient 'a' was dependent on exposure time and absorber thickness.
  • Over 70% of the detected fluence in the measured REL range originated from particles with atomic number Z ≥ 20.

Conclusions:

  • The study provides quantitative data on the heavy ion energy loss spectrum in cosmic radiation.
  • Findings highlight the significant contribution of high-Z cosmic ray particles to the measured radiation environment.
  • Results are valuable for radiation shielding and dosimetry in space missions.