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Radiographical Study of Cu–Ni Catalysts Irradiated with α-Rays

were investigated by means of autoradiography using tritium as a tracer. In the case of alloy sheets, a marked increase upon the irradiation in the amount of adsorbed hydrogen was found at the region carrying the alloy. In the case of the evaporated films, the amount of adsorbed hydrogen in the alloy region decreased upon irradiation, when the film was preliminarily sintered at 30 °C. However, the amount increased, when the film was preliminarily sintered at 250 °C. The change in the activity upon irradiation was formulated as the function of the electronic factor and the structural factor of the alloy.