Study on Radiation Damage Dynamics of Electrical Insulation Materials

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In order to examine the radiation induced conductivity (RIC) of electrical insulators, some sapphire samples (Kyocera) were irradiated at room temperature with DT neutrons and Co-60 gamma-rays. The radiation induced current of the sample was proportional to the neutron and gamma-ray flux. And the RIC coefficient of the sapphire was about 1×10ィイD1-10ィエD1/ Ω / m / Gy / s. There was not a large difference in the RIC coefficient between neutron and gamma-ray irradiatiuons. Moreover, unusual transient currents soon after irradiation, very small drift current and the offset characteristics of the sample were measured during irradiation. To explain these phenomena and to accurately evaluate the change in the electrical characteristics of irradiated ceramic insulators, we need further discussions on the electrical characteristics expected from numerical calculations of the Poissons equation based on a model of carrier transport in ceramics.