The mass attenuation coefficients and effective atomic numbers of the new Y-based superconductors have been studied in the energy range of 220 – 662 keV. The variation of photon energy has been changed from Cs-137 (662 keV) by Compton scattering technique. The mass attenuation coefficients of Y-based superconductors decreased with increasing of photon energy and do not show the significantly different compared with all Y-based superconductors. Incoherent scattering is main interaction process when photon penetration to Y-based superconductors. The effective atomic numbers and electron densities show the same trend and its depend on Y, Ba and Cu content in Y-based superconductors.
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