Risk assessment calculations are presented for the preliminary proposed solar minimum and solar maximum orbits for Space Station Freedom (SSF). Integral linear energy transfer (LET) fluence spectra are calculated for the trapped proton and GCR environments. Organ dose calculations are discussed using the computerized anatomical man model. The cellular track model of Katz is applied to calculate cell survival, transformation, and mutation rates for various aluminum shields. Comparisons between relative biological effectiveness (RBE) and quality factor (QF) values for SSF orbits are made. Cucinotta, Francis A. and Atwell, William and Weyland, Mark and Hardy, Alva C. and Wilson, John W. and Townsend, Lawrence W. and Shinn, Judy L. and Katz, Robert Johnson Space Center; Langley Research Center RTOP 199-04-16-11...