Abstract
Organic insulators, such as polyimide, epoxy resins and fibre reinforced epoxies, are irradiated in the fission reactor at about 5 K and the mechanical properties are measured in liquid helium and in liquid nitrogen without warm up. At very low temperatures, the materials are completely brittle. After irradiation of the absorbed dose of 1.1 × 10 9 rad at about 5 K, the breaking stress of epoxy resins reduces by 30 ∼ 40% and FRP and polyimide exhibit a slight decrease in the mechanical strength. FRP and polyimide have good radiation resistance with respect to the mechanical behaviour after a dose of ∼1× 10 9 rad as compared with other selected organic materials.
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