Abstract
For the nuclear design of a spectrum-controlled irradiation field in a research reactor, reaction rate distributions of gold, nickel and indium wires were measured in the Kyoto University Critical assembly in tight-pitch lattice cores of different moderator-to-fuel volume ratios with spectrum shifter regions which consist of beryllium, graphite and aluminum. Spectrum indices were obtained by measuring the cadmium ratio of gold wire and calculating the ratio of reaction rates between gold and nickel wires. The measured data were compared with the results of neutronics calculations which are employed in the neutronics design of the irradiation field.
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