NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Results of time-resolved radiation exposure measurements made during U.S. shuttle missions with a tissue equivalent proportional counterTime resolved 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 degrees to 57 degrees, and altitudes from 200-600km. Dose equivalent rates ranged from 40-5300 micro Sv/dy. The RME-III measurements are in good agreement with other dosimetry measurements made aboard the vehicle. Measurements indicate that medium- and high- Linear Energy Transfer (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. Isa-dose rate contours have been developed from measurements made during the ST-28 mission. The drift rate of the South Atlantic Anomaly (SAA) is estimated to be 0.49 degrees W/yr and 0.12 degrees N/yr. The calculated trapped proton and Galactic Cosmic Radiation (GCR) dose for the STS-28 mission were significantly lower than the measured values.
Document ID
19940039128
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Golightly, M. J.
(NASA Johnson Space Center Houston, TX, USA, United States)
Hardy, A. C.
(NASA Johnson Space Center Houston, TX, USA, United States)
Hardy, K.
(Armstrong Laboratory, Brooks AFB, TX USA, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1994
Publication Information
Publication: Life Sciences and Space Research 25 (2) Radiation Biology: Topical Meeting of the COSPAR Interdisciplinary Scientific Commission F of the COSPAR 29th Plenary Meeting, Washington, DC, Aug. 28-Sep. 5, 1
Volume: 14
Issue: 10
ISSN: 0273-1177
Subject Category
Space Radiation
Accession Number
94A62577
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available