Patent ID: 9014339
Filing Date: 2015-04-21
Classification: G01N,G21K

Abstract:
1. A scanning apparatus for scanning a beam in a single dimensional scan, the apparatus comprising: a. a source of radiation for generating a fan beam of radiation effectively emanating from a source axis and characterized by a width; b. an angle selector, stationary during the course of scanning, for limiting the extent of the scan; and c. a multi-aperture unit rotatable about a central axis in such a manner that beam flux incident on a target is the same per revolution for different fields of view of the beam on the target, wherein the multi-aperture unit includes an inner multi-aperture hoop characterized by a hoop axis, the inner multi-aperture hoop made of material opaque to the beam, and wherein the inner multi-aperture hoop includes rings of apertures spaced laterally along the hoop axis in such a manner that axial motion of the multi-aperture hoop places a ring of apertures in the beam that is collimated by a corresponding opening angle in the angle selector.