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Crystal powder packed in the shape of a rod or a polycrystalline sample is placed on the central axis of a cylindrical rolled film. Subsequently, the sample is bombarded with monochromatic X-rays to achieve the formation of a diffraction image. The various diffraction planes produce circular diffraction patterns with a scattering angle twice the size of the Q Bragg angle. These diffraction rings are also referred to as Debye -Scherrer rings. Because their angular distribution is different depending on the composition and structure of the sample, they can help determine the properties of the sample. This analysis is also called Debye - Scherrer X-ray diffraction and it is used to determine the crystal structure of solder alloys.