Abstract

Measurement of isothermal luminescence (ITL) of irradiated polyethylene terephthalate (PET) and polyethylene adipate (PEA) was carried out at low temperature over a long period of time after irradiation. The ITL decay obeys the law I(t) = I0/(1 + at)m as a function of time. All of the parameters, I0, a and m, depend on irradiation time and dose rate under which the sample was irradiated. These parameter values for PET are determined in detail. The ITL process could be interpreted as due to recombination of cation—electron pairs through electron tunneling to the cation. The distribution of the separation distances of cation—electron pairs could be obtained by Laplace inverse transformation of the ITL decay function based on an electron tunneling model.

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