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.
Results of time-resolved radiation exposure measurements made during U.S. Shuttle missions with a tissue equivalent proportional counter
Advances in Space Research ; 14 , 10 ; 923-926
1994-01-01
4 pages
Article (Journal)
Electronic Resource
English
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