Gamma Radiation Attenuation Characteristics Of Polyimide Composite With Wo2

This study presents the effect of gamma-sources on polyimide composites with WO2. Experimental studies on the influence of gamma-radiation on the samples are carried out using Cs-137 (E = 0.662 MeV) and Co-60 (E = 1.252 MeV) sources. The measurements are carried out both under "narrow" geometry (without considering the scattered radiation) conditions and under the conditions of a "wide" (considering the scattered radiation) beam of photon radiation. We present the distributions of the absorbed dose of gamma-quanta from sources without test samples and behind test samples of a certain thickness. It is shown that the introduction of the proposed WO2 filler at 60 wt% more than triples the linear attenuation coefficient of gamma-radiation at E = 0.662 MeV and is 2.36 times larger at E = 1.252 MeV compared to the polyimide without filler. After gamma-irradiation with a dose of up to 10 MGy (E = 1.152 MeV), no changes in the physicomechanical and electrical properties of the composites were observed. The flexural strength value before gamma-irradiation was 88.52 +/- 4.47 MPa, and after 89.8 +/- 5.25 MPa. The dielectric constant of the composite before and after gamma irradiation remained unchanged (epsilon = 7.6).