Investigation of gamma-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 gamma-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 (mu(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 (Am-241,Ba-133,Cs-137 and(60)Co). The obtained attenuation coefficients were used to determine the values of total molecular cross section sigma(mol), the total atomic cross section sigma(atm)(cm(2)/atom), total electronic cross-section sigma(el)(cm(2)/electron) effective atomic numberZ(eff), and effective electron numberN(eff). 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.mu(m), sigma(mol), and sigma(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,sigma(el),Z(eff)andN(eff)values decreased with weight percentage and revealed a plateau region which appeared with further increase in energy.
Faculty of Applied Health Sciences Technology
Indexed in Web Of Science
MASS ATTENUATION; ENERGY; LEAD
Alsayed, Zainab; Badawi, Mohamed S.; Awad, Ramadan; El-Khatib, Ahmed M.; and Thabet, Abouzeid A., "Investigation of gamma-ray attenuation coefficients, effective atomic number and electron density for ZnO/HDPE composite" (2020). Faculty of Applied Health Sciences Technology. 199.