Current pulse activity in irradiated low-density polyethylene

H.M. Banford, R. Fouracre, G. Chen, D.J. Tedford
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Abstract

Transient pulses or spikes of current under direct applied fields have been observed in LDPE (low-density polyethylene) following gamma irradiation in ambient air and nitrogen and reactor irradiation in air to doses between 10/sup 4/ and 10/sup 6/ Gy. This pulse activity is a function of field strength, dose, and temperature, and it is also evidently a function of the environment in which the irradiations were carried out and the type of radiation. While the production of gas and/or microvoids within the material may make a contribution to such pulse activity, it is suggested that the dominant mechanism is a field-assisted thermal detrapping process. The greater pulse activity observed with test specimens gamma-irradiated in air compared to those irradiated in nitrogen is associated with the greater abundance of trapping centers in the air samples. These derive from changes in the polymer structure due to the oxidation which took place during irradiation. A similar argument is suggested to hold for reactor versus gamma irradiations in air.<>
辐照低密度聚乙烯的电流脉冲活度
在LDPE(低密度聚乙烯)中,在环境空气和氮气中进行伽马照射以及在空气中进行反应堆照射,剂量在10/sup 4/ Gy至10/sup 6/ Gy之间,在直接施加的电场下观察到瞬时脉冲或电流峰值。这种脉冲活度是场强、剂量和温度的函数,而且显然也是进行辐射的环境和辐射类型的函数。虽然材料内气体和/或微孔的产生可能对这种脉冲活动有所贡献,但有人认为主要机制是场辅助热脱集过程。与在氮气中辐照的样品相比,在空气中辐照的样品观察到的脉冲活度更大,这与空气样品中捕获中心的丰度更大有关。这是由于辐照过程中氧化所引起的聚合物结构的变化。类似的论点也适用于空气中的反应堆辐照与伽马辐照。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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