The possibility of forming deep spectral valleys in the polychromatic spectrum of X rays with an energy of E ≥ 15 keV using diffraction band rejection is demonstrated. The rejection has been carried out by passing the radiation beam through plates of highly oriented pyrolytic graphite (HOPG) with a thickness of 0.73 and 0.58 mm at the diffraction angle θ in the interval of 3.26°–6.98°. The average values of the mosaic spread angles Δω of HOPG samples are equal to 0.72° and 0.3°. For HOPG with Δω = 0.72°, a five- and threefold attenuation of the radiation intensity due to diffraction extinction has been obtained upon the rejection of the spectral band with minima near 15.2 and 22.5 keV, respectively, and the full width at half depth of the valley is 1.4 and 3.1 keV. The proposed diffraction filtration scheme can be used in X-ray spectrometry and in medical diagnostics to reduce radiation loads.
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Turyanskiy, A.G., Senkov, V.M. & Ziyatdinova, M.Z. Formation of Spectral Valleys in the Hard X-Ray Spectrum by Diffraction Band Reject Filtering. Jetp Lett. 114, 195–199 (2021). https://doi.org/10.1134/S0021364021160104
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DOI: https://doi.org/10.1134/S0021364021160104