2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36759The review is devoted to the modern investigations of electromagnetic radiation by relativistic charged particles propagating with constant velocity through the periodic media. Two examples of radiation are considered in this review, the first corresponds to the Bragg scattering of charged particles pseudophotons in crystals, the second one to the Fresnel scattering of pseudophotons in periodic medium. Both examples play essential role in construction new compact tunable sources in X-ray region.24 pages, 7 figuresHigh Energy Physics - Experimenttext