Geodesic
Determination of refractive index of heterogeneous substances for $X$--ray radiation
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2010), pp. 63-65.

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In this paper we suggest a method for determining the refractive index of $X$–ray radiation for a one-layer medium, having a fibrous and granular structure. It is shown that the refractive index can be calculated as the ratio of intensities, measured at the location of the substance on the path of the beam between the two-crystal $X$–ray spectrometer and behind it.
Keywords: $X$–ray, refractive index, $X$–ray spectrometer. 
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V. G. Mirzoyan; S. N. Noreyan; K. M. Gevorgyan. Determination of refractive index of heterogeneous substances for $X$--ray radiation. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2010), pp. 63-65. http://geodesic.mathdoc.fr/item/UZERU_2010_2_a10/

[1] M.A. Navasardyan, V.Gh. Mirzoyan, V.V. Haroutunyan, “The influence of medium inhomogeneities on the nature and intensity of an $X-$ray interference pattern”, Izvestia AN Arm. SSR. Phyzica, 14 (1979), 265–270 (in Russian)

[2] M.A. Navasardyan, V.Gh. Mirzoyan, “Measurement of the refractive index of a substance by intensities of multiple diffracted $X-$ray”, Izvestia AN Arm. SSR. Phyzica, 15 (1980), 358–362 (in Russian)