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Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3Ã10 16 Hz to 3Ã10 19 Hz) and energies in the range 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays.
The x-ray source-to-object distance refers to the distance between the focal spot and the object to be recorded. The use of a long open-ended position indicating device (PID or cone) will enable the x-ray photons to emerge in a straighter line therefore producing a more dimensionally accurate image.rinciple One: X-rays Should be Emitted from the Smallest Source of Radiation as Possible. As electrons strike the focal spot, x-rays are emitted. The smaller the focal spot is inside the x-ray tubehead, the greater the detail or resolution of the resultant image.