EFFECTS OF GAMMA RADIATION ON DIELECTRIC PROPERTIES OF POLYETHYLENE TEREPTHALATE.
NAVAL RESEARCH LAB WASHINGTON D C
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It is possible to observe the degradation of polyethylene terepthalate film as a function of radiation exposure through measured changes of dielectric properties. The induced conductivity of air at atmospheric pressure prohibits the use of exposed electrodes or bare wires in a system for conducting measurements in the radiation field. By utilizing a system of conductive silver paint electrodes, a guarded circuit, and encapsulation of all conductors and contacts, it was possible to conduct reliable measurements in the radiation field. However, with the polystyrene and other organic materials used in the specimen holder, it is not possible to monitor these measurements in the radiation field continuously or to conduct similar measurements at elevated temperatures. The decrease in background leakage currents at low ambient pressures encourages further study toward the development of a system for continuous measurement in radiation. Author