Calculation of photon shielding properties for some neutron shielding materials

  • A. M. El-Khayatt


The objective of the present study is to calculate photon shielding parameters for seven polyethylene-based neutron shielding materials. The parameters include the effective atomic number (Z eff), the effective electron density (N eff) for photon interaction and photon energy absorption, and gamma-ray kerma coefficient (k γ). The calculations of Z eff are presented as a single-valued and are energy dependent. While Z eff values were calculated via simplistic power-law method, the energy-dependent Z eff for photon interaction (Z PI-eff) and photon energy absorption (Z PEA-eff ) are obtained via the direct method for energy ranges of 1 keV–100 GeV and 1 keV–20 MeV, respectively. The k γ coefficients are calculated by summing the contributions of the major partial photon interactions for energy range of 1 keV–100 MeV. In most cases, data are presented relative to pure polyethylene to allow direct comparison over a range of energy. The results show that combination of polyethylene with other elements such as lithium and aluminum leads to neutron shielding material with more ability to absorb neutron and γ-rays. Also, the kerma coefficient first increases with Z of the additive element at low photon energies and then converges with pure polyethylene at energies greater than 100 keV.


Neutron shielding materials Effective atomic number Kerma coefficient γ-rays 


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Copyright information

© Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Chinese Nuclear Society, Science Press China and Springer Science+Business Media Singapore 2017

Authors and Affiliations

  1. 1.Physics Department, College of ScienceAl Imam Mohammad Ibn Saud Islamic University (IMSIU)RiyadhSaudi Arabia
  2. 2.Reactor Physics DepartmentNRC, Atomic Energy AuthorityCairoEgypt

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