X-rays

For other uses, see X-ray (disambiguation). An X-ray picture (radiograph), taken by Wilhelm Röntgen, of Albert von Kölliker's hand. X-rays are a form of electromagnetic radiation with a wavelength in the range of 10 to 0.01 nanometres, corresponding to frequencies in the range 30 to 30 000 PHz (1015 hertz). X-rays are primarily used for diagnostic radiography and crystallography. X-rays are a form of ionizing radiation and as such can be dangerous. In many languages it is called ...