Patent ID: 6917667
Filing Date: 2005-07-12
Classification: G21K

Abstract:
1. A method for making parallel X-ray beam, comprising the steps of: (a) preparing a parabolic multilayer mirror having a reflecting surface with a parabolic shape determined based on a first wavelength; (b) arranging a first X-ray focal spot, which generates an X-ray with the first wavelength, at a position of a focus of the parabolic shape, and emitting the X-ray with the first wavelength from the first X-ray focal spot, so as to be reflected at the parabolic multilayer mirror to obtain a parallel X-ray beam with the first wavelength; and (c) arranging a second X-ray focal spot, which generates an X-ray with a second wavelength different from the first wavelength, at a position displaced from the focus of the parabolic shape in a direction perpendicular to an axis of the parabolic shape by a predetermined distance, and emitting the X-ray with the second wavelength from the second X-ray focal spot so as to be reflected at the parabolic multilayer mirror to obtain a parallel X-ray beam with the second wavelength.