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The monochromator selects X-radiation of certain wavelengths in the primary beam; a similar effect can be achieved by using selectively absorbing filters in the camera.
The specimen-mounting unit holds the specimen and gives it an initial position with respect to the primary beam.
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If the specimen is in plate form, it is secured on aligned Figure 1.
Goniometric head: (S) specimen, (A) arc guides for inclining the specimen in two mutually perpendicular directions, (MC) mechanism for centering the specimen; the specimen is located at the center of the arcs, and the specimen-centering mechanism is used to position the center on the axis of rotation of the camera Figure 2.
The most widely used cassettes are flat or cylindrical.
The collimator forms the working beam of primary radiation and consists of a system of slits, or apertures, that, together with the focus of the X-ray tube, define the beam direction and its divergence—that is, they determine what is called the geometry of the method.