Homogeneous Heavy Water Moderated Critical Assemblies. Part 1. Experimental

Ten critical assemblies of enriched uranyl-fluoride heavy-water solutions have been studied. In six cases, heavy water reflectors surrounded solutions in which the atomic ratio of deuterium to uranium-235 varied from 34 to 430. The remaining four assemblies were without reflector and the deuterium to U²³⁵ ratio ranged from 230 to 2080. Activation rates within the systems were measured for the resonance detectors In, Au, Pd, and Mn and for the fission detectors U²³⁵, U²³⁸, Pu²³⁹, and U²³³.