Download or read book Natural and Induced Environment in Low Earth Orbit written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term exposure of astronauts on the developing International Space Station (ISS) requires an accurate knowledge of the internal exposure environment for human risk assessment and other onboard processes. The natural environment is moderated by the solar wind which varies over the solar cycle. The neutron environment within the Shuttle in low Earth orbit has two sources. A time dependent model for the ambient environment is used to evaluate the natural and induced environment. The induced neutron environment is evaluated using measurements on STS-31 and STS-36 near the 1990 solar maximum. Wilson, John W. and Badavi, Francis F. and Kim, Myung-Hee Y. and Clowdsley, Martha S. and Heinbockel, John H. and Cucinotta, Francis A. and Badhwar, Gautam D. and Atwell, William and Huston, Stuart L. Johnson Space Center; Langley Research Center NASA/TM-2002-211668, L-18165, NAS 1.15:211668