Abstract
The luminescence of polyethylene (high density polyethylene (HDPE) and linear low density polyethylene (LLDPE)) induced by ionising irradiation has been studied. The effects of filling materials, irradiation dose and dose rate on the luminescence have been investigated. For freshly irradiated samples, both unfilled and filled, the luminescence was concluded to consist predominantly of thermoluminescence (TL). Upon subsequent ageing, the contribution of TL was found to decrease due to its decay with time after irradiation. Light emission was found to increase in the later stages of ageing, for irradiated and also for un-irradiated samples. This light was interpreted as chemiluminescence (CL), emitted as a result of polymer oxidation. The maximum of the CL was higher for irradiated than for unirradiated polyethylene, indicating that the ionising radiation gave rise to an increased amount of oxidation products. Thus, CL has been shown to be a feasible technique in studies of radiation-induced oxidation. © of SCI.
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