Formation of Spectral Valleys in the Hard X-Ray Spectrum by Diffraction Band Reject Filtering

• Published in: JETP letters 2021-08, Vol.114 (4), p.195-199
• Main Authors: Turyanskiy, A. G., Senkov, V. M., Ziyatdinova, M. Z.
• Format: Article
• Language: English
• Subjects: Atomic; Attenuation; Biological and Medical Physics; Biophysics; Molecular; Optical and Plasma Physics; Optics and Laser Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Pyrolytic graphite; Quantum Information Technology; Radiant flux density; Radiation; Rejection; Solid State Physics; Spintronics; Valleys; X ray spectra; X-rays
• ISSN: 0021-3640; 1090-6487
• DOI: 10.1134/S0021364021160104

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.