Investigation of γ-ray attenuation coefficients, effective atomic number and electron density for ZnO/HDPE composite

Bulk and nano ZnO/HDPE composite with different weight fractions (10, 20, 30 and 40%) of ZnO as a filler were prepared and studied for radiation shielding properties against γ-ray. The structural, morphological and functional properties of the composites were identified using x-ray diffraction (XRD)...

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Published inPhysica scripta Vol. 95; no. 8; pp. 85301 - 85310
Main Authors Alsayed, Zainab, Badawi, Mohamed. S., Awad, Ramadan, El-Khatib, Ahmed. M., Thabet, Abouzeid. A.
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.08.2020
Subjects
HDPE
mass attenuation coefficient
nano and bulk ZnO
total atomic and electronic cross sections
Online AccessGet full text
ISSN0031-8949
1402-4896
1402-4896
DOI10.1088/1402-4896/ab9a6e

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Abstract Bulk and nano ZnO/HDPE composite with different weight fractions (10, 20, 30 and 40%) of ZnO as a filler were prepared and studied for radiation shielding properties against γ-ray. The structural, morphological and functional properties of the composites were identified using x-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared specrtroscopy (FTIR). The results confirmed the formation of ZnO nanoparticles with crystallite size of 27 nm and revealed their good dispersion within the polymer matrix compared to bulk ZnO as well as interaction mechanism between the filler and the polymer matrix. The mass attenuation coefficient ( m) for the composite was measured experimentally using a well calibrated high purity germanium cylindrical detector (HPGe) at energies (59.54, 356.01, 661.66, 1173.33 and 1332.50 keV) for different radioactive point sources (241Am, 133Ba, 137Cs and 60Co). The obtained attenuation coefficients were used to determine the values of total molecular cross section mol, the total atomic cross section atm (cm2/atom), total electronic cross-section el (cm2/electron) effective atomic number Zeff, and effective electron number Neff. Using NIST XCOM photon cross section database, the theoretical radiation parameters were calculated for bulk ZnO/HDPE composite and compared with the experimental results of both bulk and nano ZnO/HDPE composite. The obtained results revealed good agreement compared to theoretical values. m, mol, and atm values decreased with incident photon energy and increased with weight percentage of both bulk and nano ZnO filler. However, these values were greater for nano ZnO/HDPE composite compared to bulk ZnO/HDPE composite with the same weight percentage. Whereas, el, Zeff and Neff values decreased with weight percentage and revealed a plateau region which appeared with further increase in energy.
AbstractList Bulk and nano ZnO/HDPE composite with different weight fractions (10, 20, 30 and 40%) of ZnO as a filler were prepared and studied for radiation shielding properties against γ-ray. The structural, morphological and functional properties of the composites were identified using x-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared specrtroscopy (FTIR). The results confirmed the formation of ZnO nanoparticles with crystallite size of 27 nm and revealed their good dispersion within the polymer matrix compared to bulk ZnO as well as interaction mechanism between the filler and the polymer matrix. The mass attenuation coefficient ( m) for the composite was measured experimentally using a well calibrated high purity germanium cylindrical detector (HPGe) at energies (59.54, 356.01, 661.66, 1173.33 and 1332.50 keV) for different radioactive point sources (241Am, 133Ba, 137Cs and 60Co). The obtained attenuation coefficients were used to determine the values of total molecular cross section mol, the total atomic cross section atm (cm2/atom), total electronic cross-section el (cm2/electron) effective atomic number Zeff, and effective electron number Neff. Using NIST XCOM photon cross section database, the theoretical radiation parameters were calculated for bulk ZnO/HDPE composite and compared with the experimental results of both bulk and nano ZnO/HDPE composite. The obtained results revealed good agreement compared to theoretical values. m, mol, and atm values decreased with incident photon energy and increased with weight percentage of both bulk and nano ZnO filler. However, these values were greater for nano ZnO/HDPE composite compared to bulk ZnO/HDPE composite with the same weight percentage. Whereas, el, Zeff and Neff values decreased with weight percentage and revealed a plateau region which appeared with further increase in energy.
Author Thabet, Abouzeid. A.
Awad, Ramadan
El-Khatib, Ahmed. M.
Alsayed, Zainab
Badawi, Mohamed. S.
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Snippet Bulk and nano ZnO/HDPE composite with different weight fractions (10, 20, 30 and 40%) of ZnO as a filler were prepared and studied for radiation shielding...
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SubjectTerms HDPE
mass attenuation coefficient
nano and bulk ZnO
total atomic and electronic cross sections
Title Investigation of γ-ray attenuation coefficients, effective atomic number and electron density for ZnO/HDPE composite
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