X-ray absorption near edge structure -- Congresses. : EXAFS and near edge structure III : proceedings of an international conference, Stanford, CA, July 16-20, 1984 / editors, K.O. Hodgson, B. Hedman, and J.E. Penner-Hahn
X-ray astronomy -- Congresses. : X-ray astronomy : proceedings of a symposium of the twenty-first plenary meeting of COSPAR, Innsbruck, Austria, 29 May to 10 June 1978 / edited by W. A. Baity and L. E. Peterson
A noninvasive method for assessing BODY COMPOSITION. It is based on the differential absorption of X-RAYS (or GAMMA RAYS) by different tissues such as bone, fat and other soft tissues. The source of (X-ray or gamma-ray) photon beam is generated either from radioisotopes such as GADOLINIUM 153, IODINE 125, or Americanium 241 which emit GAMMA RAYS in the appropriate range; or from an X-ray tube which produces X-RAYS in the desired range. It is primarily used for quantitating BONE MINERAL CONTENT, especially for the diagnosis of OSTEOPOROSIS, and also in measuring BONE MINERALIZATION
Examination of any part of the body for diagnostic purposes by means of X-RAYS or GAMMA RAYS, recording the image on a sensitized surface (such as photographic film)
The scattering of x-rays by matter, especially crystals, with accompanying variation in intensity due to interference effects. Analysis of the crystal structure of materials is performed by passing x-rays through them and registering the diffraction image of the rays (CRYSTALLOGRAPHY, X-RAY). (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)