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In this paper, the change in partial discharge resistance of low density polyethylene and epoxy resin irradiated with γ-ray at high dose rate has been investigated. The samples were irradiated in air up to 100 kGy then up to 1000 kGy by means of a 60Co γ-source at a dose rate of 10 kGy/h. By applying an AC voltage of 8 kHz between a pair of needle-plane electrode, partial discharge was generated to...
The effect of gamma-ray irradiation on relative permittivity, ac conductivity and dielectric loss tangent of epoxy resin and polyethylene has been investigated. Laminated samples were irradiated by 60Co gamma source at room temperature in air with a dose rate of 10 kGy/h and the total dose were 100 kGy and 1000 kGy. The dielectric properties were measured by using a Precision LCR Meter (Agilent E4980A)...
This paper presents study aimed at understanding the effect of gamma-ray irradiation on surface charge decay through bulk of epoxy resin. Laminated epoxy resin was employed as test sample which was irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy / h by using a 60Co gamma-source before the test. Surface charge was introduced by corona charging method and surface potential...
Polymer insulating materials installed in electronic and electrical devices have been used in space equipment and nuclear power station where the materials are exposed to high energetic radioactive rays. The molecular structure can be changed by radiation induced chemical reactions that possibly lead to the variation of characteristics of surface charge dynamics, which in turn influences the safe...
Epoxy resin (ER) laminate was employed as sample to investigate the effects of gamma-ray irradiation on dynamic behavior of surface charge decay. Before the test, the samples were irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy / h by using a 60Co gamma-source. The experiment was carried out at room temperature with relative humidity of ~ 50%. The sample surface...
Er3+-doped fluoride glass ceramics planar waveguides containing LaF3 or binary LaF3-ZrF4 nanocrystals have been fabricated by Physical Vapor Deposition (PVD). A quantitative analysis of the photoluminescence of the 1.54 µm emission band of Er3+ ions has demonstrated that erbium ions are partitioned in both crystals and vitreous phase. The solubility of Er3+ in the segregated LaF3 nanocrystals can...
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