Mathematics – Probability
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..246.1251s&link_type=abstract
Proceedings of the ninth symposium on space nuclear power systems. AIP Conference Proceedings, Volume 246, pp. 1251-1258 (1992)
Mathematics
Probability
Structural And Shielding Materials
Scientific paper
Manned nuclear propulsion space vehicles require radiation shielding to protect the crew from a number of diverse radiation sources: the propulsion system reactor, the Earth's Van Allen radiation belts, anomalously large solar proton events (ALSPEs), and galactic cosmic radiation (GCR). The sources are characterized not only in terms of species and energy spectrum, but also by frequency, duration, and probability of occurrence. Such factors as effectiveness of available vehicle materials (such as propellants) in providing shielding and operational strategies (such as multiple periapsis burns) must be factored into the design and mission planning for the vehicle. The optimum distribution of the shielding to limit exposure to the crew and meet established dose limits with minimum vehicle mass was determined for a typical Mars transfer vehicle using a NERVA-derivative nuclear rocket engine. For this case, the optimum shielding for a 434-day mission was also adequate to limit the exposure of crew to short-term exposure to historical ALSPEs.
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