Ray Type Dependence of Radiation Induced Surface Activation Phenomenon

Ray Type Dependence of Radiation Induced Surface Activation Phenomenon

The phenomenon named Radiation Induced Surface Activation (RISA) was discovered recently. It is a phenomenon involving the activation of surfaces of metallic oxides attributable for strong affinity for water. In this work, we examined wettability increase under irradiations with γ-ray and UV, as wel...

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Veröffentlicht in:Nihon Kinzoku Gakkai shi (1952) 2007-04, Vol.71 (4), p.423
Hauptverfasser: Kariyazaki, Makoto, Abe, Hiroaki, Sayano, Akio, Kano, Fumihisa, Katano, Yoshio, Onitsuka, Takashi, Sekimura, Naoto
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container_issue 4
container_start_page 423
container_title Nihon Kinzoku Gakkai shi (1952)
container_volume 71
creator Kariyazaki, Makoto
Abe, Hiroaki
Sayano, Akio
Kano, Fumihisa
Katano, Yoshio
Onitsuka, Takashi
Sekimura, Naoto
description The phenomenon named Radiation Induced Surface Activation (RISA) was discovered recently. It is a phenomenon involving the activation of surfaces of metallic oxides attributable for strong affinity for water. In this work, we examined wettability increase under irradiations with γ-ray and UV, as well as its degradation under non-irradiation condition by measuring the changes of water contact angle on oxide layers formed onto Zircaloy-4 plates. The water contact angle for the sample surface decreased gradually under irradiation, and increased gradually by darkroom storage after irradiation. The theoretical formula, which describes the development of the hydrophilic surface under irradiation and its stability, was fitted to the experimental results. It caused us to propose the existence of two kinds of hydrophilic factors in terms of stability, whose formation probabilities depend on the type of irradiation.
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title Ray Type Dependence of Radiation Induced Surface Activation Phenomenon
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