Abstract
Thorium nitrate was irradiated together with Au and Co neutron fluence monitors in the Kyoto University Reactor (KUR). The thorium was chemically purified using the solvent extraction and ion‐exchange methods. The γ‐rays in the decay of Th‐234 were measured using high‐purity Ge detectors (HPGes). Thermal neutron fluxes and epithermal indexes, i.e., the relative strength of the epithermal dE/E component, were determined using the Westcott convention. Five effective cross sections were determined for epithermal indexes from 0.01 to 0.04 using three irradiation facilities. The cross section for 2200 m/s neutrons and the resonance integral were deduced to be (1270±50) b and (1680±930) b, respectively, from the results of the five effective cross sections.
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