Abstract:
A dynamic radiography system for examining an optically opaque object containing radiation scattering centers by irradiating the object with penetrating radiation to cause radiation scattering by these scattering centers, causing periodic vibration of these scattering centers, detecting radiation scattered by the scattering centers in the object along at least two noncongruent detection channels which are at an angle with each other and which intersect at a common volume within the object, and correlating the outputs of the detectors with a frequency parameter of the vibration to derive thereby information of internal physical and mechanical characteristics of the object.
Abstract:
Disclosed are apparatus and methods for controlling radiation, such as a beam of neutrons, low energy gamma rays, X-rays, or electrons, by means of successive diffractions by diffracting media, such as crystals, vibrating in a compression mode in a shear mode or in a complex superimposed vibrational mode. The radiation beam may be subjected to successive diffractions by an arrangement of such vibrating diffracting media and may thus be contained in a substantially closed path such as a hexagonal path or a figure-eight path. Alternatively, the radiation beam may be subjected to one or more diffractions by an arrangement of such vibrating diffracting media for the purpose of controlling the beam in a non-closed path.