The quasimonochromatic X-ray radiation source on the basis of the electron beam of the microtron Y.N. Adischev a , V.N. Zabaev a , A.P. Potylitsyn a , U.S. Salikhbaev b , A.N. Safarov c , B.A. Skripnik c , Y.Y. Stepnov c , I. Khakberdiev c, * a Nuclear Physics Institute of Tomsk Polytechnic University, Lenin Ave. 2-a, P.O. Box 25, 634050 Tomsk, Russia b Institute of Nuclear Physics of Academy Science Republic of Uzbekistan, Ulugbek, 702132 Tashkent, Uzbekistan c Nuclear Physics Laboratory of Samarkand State University, University Bouleward 15, 703004 Samarkand, Uzbekistan Received 14 March 2002; received in revised form 21 May 2002 Abstract On the basis of the electron beam (energy E 0 ¼ 13 and 22 MeV) the experimental setup for obtaining of quasi- monochromatic X-ray radiation by the method of Bragg diffraction bremsstrahlung X-ray radiation (DXR) has been developed. First results on the obtaining of DXR, confirming the validity of the method, are presented. Ó 2002 Elsevier Science B.V. All rights reserved. PACS: 78.g; 78.Ck; 79.tt Keywords: Quasimonochromatic X-ray radiation; Diffraction bremsstrahlung 1. Introduction The execution of many experiments requires the use of the monochromatic photons source of the energy and intensity that can be varied in a wide region. Therefore the development of such uni- versal source is very actual problem. Recently, works were performed [1,2] on the basis of linear electron accelerator and X-ray tube demonstrated the possibility of obtaining tuned quasimono- chromatic X-ray radiation (QMXR) beam. The first method uses the known effect of parametric X-ray radiation (PXR) [3]. In that method, the electromagnetic field of the flying particles excites the polarization state of the periodical atoms of crystal target, which further would emit X-ray radiation [4]. The spectrum PXR is characterized by clear maximum with the energy E n of which is defined in dependence on the values of known Bragg angle h B and the distance between the neighboring planes of crystallographic structures d, E n ¼ np=d sin h B ; ð1Þ where n is the integer number. By substitution of the crystal, changing its crystallographic plane, bending it around of the goniometric rotating axis Nuclear Instruments and Methods in Physics Research B 201 (2003) 300–306 www.elsevier.com/locate/nimb * Corresponding author. Tel.: +998-662-21-42-37; fax: +998- 662-22-08-20. E-mail address: khakb@samarkand.uz (I. Khakberdiev). 0168-583X/02/$ - see front matter Ó 2002 Elsevier Science B.V. All rights reserved. PII:S0168-583X(02)01279-X