Electrical and Mechanical Properties of Coaxial Cable for Use under High Temperature and Radioactive Conditions

Abstract

We examined the effect of γ-ray irradiation at different temperatures (room temperature and 250°C) and atmospheric conditions (air and N₂) on the electrical and mechanical characteristics of thermoplastic polyimidc (TPI) insulated and sheathed coaxial cable which is designed for high temperature and radioactive use. It was found that the TPI insulated and sheathed coaxial cable had good radiation resistance at 250°C under N2, γ-ray irradiation of 75 MGy under air, and electron beam irradiation of about 100 MGy under Hc. It was also found that both the crosslinking and the crystallization of TPI was accelerated by the synergistic effect of heat and γ-ray irradiation.