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Gamma radiation attenuation characteristics of composites based on polyimide track membranes filled with nanodispersed Pb
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DOI：10.1016/j.pnucene.2021.103959.png)
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Abstract
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The paper presents data on the effect of gamma-radiation on polymer composites based on polyimide track membranes filled with nanodispersed lead. The radiation-protective properties of the composites were studied by theoretical and experimental methods. To carry out experimental studies on the effect of gamma-radiation on the composite, radioactive sources cesium-137 and cobalt- 60 were used. The calculated data of the linear attenuation coefficient of gamma-radiation in the composite, depending on the initial energy of gamma-quanta in the range from 0.5 to 5 MeV, are presented. The contribution of the photoelectric effect, the Compton effect, and the formation of electronpositron pairs to the total linear attenuation coefficient of the gamma radiation of the composite is estimated. When gamma-radiation passes through 2.5 mm of the composite, the intensity of gamma-radiation absorption decreases by 17.7 and 4.4% at radiation energies of 0.5 and 5 MeV, respectively. It was experimentally established that the introduction of nanodispersed filler Pb into a polyimide track membrane made it possible to increase the linear attenuation coefficient of gamma-radiation by more than 6 times at an energy of 0.662 MeV, and by a factor of 3.7 at an energy of 1.252 MeV as compared to pure polymeric material.
Keywords:
Polyimide track membranes
Nanodispersed lead
Electrodeposition
gamma-radiation
Linear attenuation coefficient
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