TY - RPRT TI - Using Space Weather Variability in Evaluating the Radiation Environment Design Specifications for NASA's Constellation Program AU - Coffey, Victoria N. AU - Blackwell, William C. AU - Minow, Joseph I. AU - Bruce, Margaret B. AU - Howard, James W. PY - 2007 UR - https://ntrs.nasa.gov/citations/20080013351 ID - 20080013351 ER -