[IEEE 2011 IEEE Radiation Effects Data Workshop (in conjunction with NSREC 2011) - Las Vegas, NV, USA (2011.07.25-2011.07.29)] 2011 IEEE Radiation Effects Data Workshop - Calculating Spacecraft Single Event Environments with FLUKA: Investigating the Effects of Spacecraft Material Atomic Number on Secondary Particle Showers, Nuclear Reactions, and Linear Energy Transfer (LET) Spectra, Internal to Spacecraft Avionics Materials, at High Shielding Mass