X-ray Definition and 306 Threads

An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (30×1015 Hz to 30×1018 Hz) and energies in the range 124 eV to 124 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to as Röntgen radiation, after the German scientist Wilhelm Conrad Röntgen, who discovered it on November 8, 1895. He named it X-radiation to signify an unknown type of radiation. Spellings of X-ray(s) in English include the variants x-ray(s), xray(s), and X ray(s).

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  1. wolram

    Exploring the X-ray Universe: XMM-Newton Studies Dark Energy

    http://www.astronomy.com/Content/Dynamic/Articles/000/000/001/604djcxv.asp XMM-Newton studies the X-ray universe from Earth orbit. ESA A mystery that has been haunting the fields of physics and cosmology has just grown deeper. Dark energy, that stealthy ghost that lurks in the...
  2. Ivan Seeking

    A Girl with an X-ray vision and Pravda

    Does anyone remember when Pravda only told the government's lies? I am posting this as a reminder that IMHO, Pravda is not a valid news source. http://english.pravda.ru/science/19/94/377/11797_phenomenon.html
  3. Antepolleo

    Universal Gravitation and X-ray pulses

    I'm having a little bit of a problem with this one. Here's the question: X-ray pulses from Cygnus X-1, a celestial x-ray source, have been recorded during high-altitude rocket flights. The signals can be interpreted as originating when a blob of ionized matter orbits a black hole with a...
  4. J

    X-ray tube used for cancer therapy

    Heres the problem: An x-ray tube used for cancer therapy operates at 4.0 MV, with a beam current of 25 mA striking the metal target.Nearly all of this power is transferred to a stream of water flowing through the holes drilled in the target. What rate of flow, in Kg/sec, is needed if the...
  5. Ivan Seeking

    Can X-rays penetrate clothing and reveal hidden objects?

    " To the eye, she is dressed in a skirt and blazer in dark, businesslike colors. On the monitor she is naked..." http://news.yahoo.com/news?tmpl=story2&u=/030625/168/4i6lv.html&e=1&ncid=1756
  6. E

    Improve X-Ray Crystalography - Current Work

    does anybody know of any current work that is being done to improve x-ray crystalography techniques?
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