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Modifications of Structural, Optical, and Carbonaceous Clusters in Neutron Irradiated C12H18O7 Polymeric Detector |
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PP: 91-100 |
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Author(s) |
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Y. S. Rammah,
A. R. El-Sersy,
I. A. El-Mesady,
F.I. El-Agawany,
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Abstract |
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| The chemical, optical, and carbonaceous clusters properties of CR-39 detectors irradiated at high neutron doses were investigated. They were exposed to neutron source for different times to obtain varies doses. Fourier Transform Infrared (FTIR) and UV-vis spectroscopy have been done for pristine and CR-39 irradiated samples. The chemical and optical properties changes of CR-39 corresponding to the neutron exposure were obtained. In FTIR spectra, the intensities of the absorbance peaks showed a decrease with increasing neutron doses. The UV-vis spectra of the pristine and irradiated CR-39 detectors were analyzed to discuss the induced changes after irradiation. The optical energy band gap, Eoptical for samples was calculated using Tauc’s and absorption spectrum fitting (ASF) methods. Urbach’s energy, EUrbach for the samples was estimated. Carbonaceous clusters including number of carbon atom per conjugated length (N) and number of carbon atom per clusters (M) corresponding to the optical band gap, Eoptical were calculated. In addition, refractive index (n) for pristine and neutron irradiated samples was calculated. Values of optical band gaps displayed a significant decreasing trend in both of direct and indirect transitions, whereas values of N, M, and n increased with neutron dose. Results reveal that CR-39 can be used as neutron dosimetry.
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