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Comparative analysis of the diffuse reflectance spectra (300-2100 nm) and of the integrated absorption factor of coatings based on micropowders, nanopowders, and micropowders modified with Al 2 O 3 nanopowders has been performed. In addition, the changes in the spectra resulting from electron irradiation of the powders with energies of 30 keV at a fluence of up to 3⋅16 cm -2 have been analyzed. It has been found that the diffuse reflectance decreases in order of coatings based on micro-powders, nano-powders and modified powders, while radiation resistance increases in order of coatings based on nano-powders, modified and micropowders.

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