A material shield designed to protect a spacecraft against an atomic particle beam will, of necessity, be quite massive; consequently, even modest fractional-weight savings would be significant. With this goal in mind, the particle stopping power and range in various materials were investigated. The lightest shield materials are compounds composed of hydrogen and other light elements. Keywords include: Particle beams; Lethality; Survivability; Material atom shield; Particle ranges; and Stopping powers. ...