High Quality Content by WIKIPEDIA articles! X-radiation is electromagnetic radiation that spans 3 decades in wavelength ~(8 nm - 8 pm), frequency ~(50 PHz - 50 EHz) and energy ~(0.12 - 120 keV). In terms of temperature, 1 eV = 11,604 K. X-rays (0.12 to 120 keV) correspond to 1.39 x 106 (1.39 MK) to 1.39 x 109 K (1.39 GK). From 10 to 0.1 nanometers (nm) (about 0.12 to 12 keV) they are classified as soft X-rays, and from 0.1 nm to 0.01 nm (about 12 to 120 keV) as hard X-rays. Super soft X-rays overlap with EUV and range from as low as ~15 eV up to 0.5 keV. The upper limit results from interstellar absorption of X-rays, especially within the plane of the Milky Way. Analogous to super soft X-rays are the super hard X-rays which overlap with soft gamma-rays.

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