The electroluminescence of gamma-irradiated polyethylene at 77K

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Abstract
Following gamma -irradiation at 77K, the isothermal luminescence (ITL) exhibited by polyethylene film has been enhanced by the application of an electric field. The effect is not permanent but is correlated with the magnitude of the ITL signal. It has been attributed to the field-assisted thermal detrapping of trapped electrons and subsequent recombination. A simple one-dimensional model accounts for many features of the experimental results, but breaks down when the time dependence of the electroluminescence is examined. A three-dimensional model has been formulated which indicates the essential features. However, more detailed information on the distribution of trapped-electron/positive-ion separations is required, together with a better model of the ITL decay.