| 摘要 |
PURPOSE:To simplify a mechanism, by making a spectral crystal perform special actions to permit various devices set at an X-ray concentration point and therebehind to perform a fixed linear motion after the spectroscopy. CONSTITUTION:A straight line passing through a point S of an X rays source 1 and a point D of a spectral slit 3 are defined as X axis, an axis vertical to the X axis passing through the point S, Y axis and the center coordinate of a spectral crystal 2, C (x, y). When acute angleSTC=acute angleCSD=theta is varied while the crystal 2 is held on a Rowland circle with the radius R, the point C depicts a circular locus as given as x<2>+(y-R)<2>=R<2>. Therefore, when a scanning is done so that the point (C) will move on the circumference of the circle to ensure that normal at the point C is always vertical to the X-axis, the crystal 2 can always stay on the Rowland circle with the radius R so that X rays can be concentrated on the point D by an angle corresponding to the size of the crystal at a desired angle theta while the point D always exists on the X-rays separated by the distance of 2x from a point 1. |
