Definition of X ray

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x ray
n
1. electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target [syn: x ray, x-radiation, roentgen ray]


2. a radiogram made by exposing photographic film to x rays; used in medical diagnosis [syn: roentgenogram, x ray, x-ray picture, x-ray photograph]

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x-gha m.; x ghatú m.

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Noun
1. electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
(synonym) X-radiation, roentgen ray
(hypernym) electromagnetic radiation, electromagnetic wave, nonparticulate radiation
2. a radiogram made by exposing photographic film to X rays; used in medical diagnosis
(synonym) roentgenogram, X-ray picture, X-ray photograph
(hypernym) radiogram, radiograph, shadowgraph, skiagraph, skiagram
(hyponym) angiocardiogram

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Verb
1. examine by taking x-rays
(hypernym) examine, see
(derivation) X-raying, X-radiation
2. take an x-ray of something or somebody; "The doctor x-rayed my chest"
(hypernym) photograph, snap, shoot
(derivation) X-raying, X-radiation
(classification) photography, picture taking

Psychic surgeon

A very high energy form of electromagnetic radiation (though not as high energy as gamma rays ). X-rays typically have wavelengths from a few picometers up to 20 nanometers. X-rays easily penetrate soft tissue, which makes them useful in medical imaging and in radiation therapy.

A type of electromagnetic radiation having low energy levels. XENON A heavy gas used in specialized electric lamps.

Definition
Powder X-ray Diffraction (XRD) is one of the primary techniques used by mineralogists and solid state chemists to examine the physico-chemical make-up of unknown solids. This data is represented in a collection of single-phase X-ray powder diffraction patterns for the three most intense D values in the form of tables of interplanar spacings (D), relative intensities (I/I_o), and mineral name.
The XRD technique takes a sample of the material and places a powdered sample in a holder, then the sample is illuminated with x-rays of a fixed wave-length and the intensity of the reflected radiation is recorded using a goniometer. This data is then analyzed for the reflection angle to calculate the inter-atomic spacing (D value in Angstrom units - 10^-8 cm). The intensity(I) is measured to discriminate(using I ratios) the various D spacings and the results are to identify possible matches.

constructive interference of x-ray beams that are scattered by atoms of a crystal.

High energy electromagnetic radiation of wavelengths in the range 10 to 0.1 nanometres. The only photons which are usually more energetic are gamma rays (which originate in the nucleus of atoms). X-rays are extra-nuclear and have two sources: (1). A characteristic (e.g.K- or L-) X-ray photon is created and emitted when an electron drops down orbits to fill a vacancy in an innermost shell. The wavelength of the photon is unique to the atom and affords an unambigious method of identifying the element by use of an X-ray spectrometer . (2). A bremsstrahlung photon is produced when a high speed positive or negative electron decelerates when passing through the electric field in the close vicinity of an atomic nucleus. The spectrum in this case is continuous up to the maximum energy of the bombarding electrons.

Electromagnetic radiation of very short wavelength and very high energy; x-rays have shorter wavelengths than ultraviolet light but longer wavelengths than cosmic rays.

The part of the electromagnetic spectrum whose radiation has somewhat greater frequencies and smaller wavelengths than those of ultraviolet radiation. Because x-rays are absorbed by the Earth's atmosphere, x-ray astronomy is performed in space.

electromagnetic radiation with a wavelength greater than 10 nanometers and less than 10 picometers.

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Raymond Williams, US DJ.

vak-zehl, vak-zehl-tor

The part of the electromagnetic spectrum whose radiation has somewhat greater frequencies and smaller wavelengths than those of ultraviolet radiation. Because x-rays are absorbed by the Earth's atmosphere, x-ray astronomy is performed in space. Light that is so blue humans cannot see it. A band of the spectrum between the ultraviolet and the gamma-ray. Photons of X-ray light are more energetic than photons in the ultraviolet but less energetic than photons in the gamma-ray. X-radiation can go through human skin tissue but is stopped by dense bones. This property thus makes X-rays valuable in medicine.

A type of high-energy radiation. In low doses, x-rays are used to diagnose diseases by making pictures of the inside of the body. In high doses, x-rays are used to treat cancer.

The use of high-energy radiation from x-rays to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body (external-beam radiation therapy) or from materials called radioisotopes. Radioisotopes produce radiation and can be placed in or near the tumor or in the area near cancer cells. This type of radiation treatment is called internal radiation therapy, implant radiation, interstitial radiation, or brachytherapy. Systemic radiation therapy uses a radioactive substance, such as a radiolabeled monoclonal antibody, that circulates throughout the body. X-ray therapy is also called radiation therapy, radiotherapy, and irradiation.

High-energy radiation used in low doses to diagnose cancer and in high doses to treat the disease.

electromagnetic radiation caused by deflection of electrons from their original paths, or inner orbital electrons that change their orbital levels around the atomic nucleus. X-rays, like gamma rays can travel long distances through air and most other materials. Like gamma rays, x-rays require more shielding to reduce their intensity than do beta or alpha particles. X-rays and gamma rays differ primarily in their origin: x-rays originate in the electronic shell; gamma rays originate in the nucleus. See also neutron.
  

An X-ray picture in which the beams pass from front-to-back (anteroposterior). As opposed to a PA (posteroanterior) film in which the rays pass through the body from back-to-front.

High-energy radiation. It is used in low doses to diagnose diseases and in high doses to treat cancer.