AbstractTime-resolved radiation exposure measurements inside the crew compartment have been made during recent Shuttle missions with the USAF Radiation Monitoring Equipment-III (RME-III), a portable four-channel tissue equivalent proportional counter. Results from the first six missions are presented and discussed. The missions had orbital inclinations ranging from 28.5° to 57°, and altitudes from 200–600 km. Dose equivalent rates ranged from 40–5300 μSv/dy. The RME-III measurements are in good agreement with other dosimetry measurements made aboard the vehicle. Measurements indicate that medium- and high-LET particles contribute less than 2% of the particle fluence for all missions, but up to 50% of the dose equivalent, depending on the spacecraft's altitude and orbital inclination. Iso-dose rate contours have been developed from measurements made during the STS-28 mission. The drift rate of the South Atlantic Anomaly (SAA) is estimated to be 0.49 °W/yr and 0.12 °N/yr. The calculated trapped proton and Galactic Cosmic Radiation (GCR) dose for the STS-28 mission were significantly lower than the measured values.


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    Title :

    Results of time-resolved radiation exposure measurements made during U.S. Shuttle missions with a tissue equivalent proportional counter


    Contributors:
    Golightly, M.J. (author) / Hardy, A.C. (author) / Hardy, K. (author)

    Published in:

    Advances in Space Research ; 14 , 10 ; 923-926


    Publication date :

    1994-01-01


    Size :

    4 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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