Introduction. Electrical and fiber-optic cables of on-board systems for transmitting monitoring, control and communication signals are increasingly used in nuclear power plants, aircraft systems and military applications. Such operating conditions are characterized by an increased level of ionizing radiation compared to the background: from 10 kGy in space applications to 1 GGy in the corium of a nuclear reactor. Problem. The resistance of polymer insulation to the action of ionizing radiation is determined on the basis of mechanical, thermophysical, physicochemical indicators that reflect the local characteristics of the polymer insulation of electrical cables. Modern special radiation-resistant optical fibers are capable of operating under the action of gamma radiation with a dose of 1 MGy. To ensure mechanical strength and protection of the optical fiber from moisture, high-strength structural elements and hydrophobic fillers are used in the optical cable. The goal of the work consists in establishing the effect of gamma radiation on unshielded cables with unshielded twisted pairs and optical cables with the determination of the dynamics of changes in the electrical properties o
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