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Related Experiment Videos

Active dosimetric measurements on shuttle flights.

G D Badhwar1, A Konradi, A Hardy

  • 1National Aeronautics and Space Administration, Johnson Space Center, Houston, TX 77058.

International Journal of Radiation Applications and Instrumentation. Part D, Nuclear Tracks and Radiation Measurements
|January 1, 1992
PubMed
Summary

A new space radiation spectrometer accurately measured absorbed dose and dose distribution. Its findings align with models, offering better crew risk assessment than older methods.

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Life sciences in space research·2023

Area of Science:

  • Space science and dosimetry
  • Radiation physics in space environments

Background:

  • Space missions expose astronauts to significant penetrating radiation.
  • Accurate measurement of absorbed dose and linear energy transfer (LET) is crucial for crew safety.
  • Existing dosimetry methods have limitations in providing detailed, real-time data.

Purpose of the Study:

  • To describe a tissue-equivalent proportional counter spectrometer for space radiation dosimetry.
  • To evaluate the instrument's performance in measuring absorbed dose and LET distribution.
  • To compare instrument measurements with established radiation models.

Main Methods:

  • Utilized a compact (0.7 kg) tissue-equivalent proportional counter spectrometer.
  • Flown on the STS-31 Space Shuttle mission (April 1990).
Keywords:
NASA Center JSCNASA Discipline Number 00-00NASA Discipline Number 04-10NASA Discipline Radiation HealthNASA Program FlightNASA Program Radiation Health

Related Experiment Videos

  • Measured absorbed dose and dose distribution as a function of LET and time.

    • Main Results:

    • The instrument successfully measured absorbed dose and LET distribution for space radiation.
    • Measured total dose showed excellent agreement with calculations from the AP8MAX trapped radiation belt proton model.
    • Observed LET frequency distribution also agreed well with AP8MAX model predictions.

    Conclusions:

    • The tissue-equivalent proportional counter spectrometer is effective for space dosimetry.
    • Active instruments offer superior crew risk assessment capabilities compared to passive detectors like thermoluminescent detectors or plastic track detectors.
    • The instrument's performance validates the AP8MAX model for trapped radiation in low Earth orbit.