CRITICAL MASSES OF ORALLOY IN THIN REFLECTORS

Abstract

Critical masses were measured for 5.25 in. diameter Oy cylinders in 0.5 and 1 in. thick reflectors of Be, graphite, Mg, Al, Ti, mild steel, Cu, W alloy, Tu, Ni, Co, Mo, Al/sub 2/O/sub 3/, Mo/sub 2/C, and polythene. These results were converted to the equivaleat spherical critical masses of Oy and compared to yield consistent transport cross sections for the reflector materials. In addition, critical masses of Oy spheres in ~2 and ~4 in. thick spherical reflectors of W alloy, Fe, Ni, Ni-silver, Cu, Zn, Th, Be, BeO, C, and Tu were determined. (auth)