Effective atomic numbers and electron densities for some lanthanide oxide compounds using direct method in the energy region of 1 keV - 20 MeV

Abstract

In this paper, the effective atomic numbers and electron densities representing interaction of gamma rays with oxides of lanthanides have been studied. The effective atomic numbers for photon energy-absorption (Z_PEAeff) and photon interaction (Z_PIeff), and relative to air Z_Reff, the effective electron densities for photon energy-absorption (N_PEAeff) and photon interaction (N_PIeff) were calculated using the values of the mass attenuation and energy absorption coefficients. The variation of Z_PEAeff, Z_PIeff, Z_Reff, N_PEAeff and N_PIeff with energy were shown graphically. In the continuous energy region, it was observed that there are agreements and disagreements between photon interaction and photon energy-absorption for effective atomic numbers and electron densities of compounds in different energy regions. In addition, absorption edge effects on effective atomic numbers leading more than a single value of effective atomic number at a specific energy have been discussed for the given compounds. Comparisons with experiments wherever possible have been carried out for calculated values of Z_eff and N_eff.

Keywords

• Lanthanides,Effective atomic number,Effective electron density,Radiation interaction

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