X-RAY is roentgen (Wilhelm Conrad R?ntgen) rays, also known as "X-rays" (X-Ray), it is a very short wavelength electromagnetic radiation, its wavelength is about (20 ~ 0.06) × 10-8 cm. Roentgen rays have a high penetrating ability and can pass through many substances that are opaque to visible light, such as inked paper and wood. This invisible to the naked eye rays can make a lot of solid materials visible fluorescence, so that the photographic negative sensitization as well as air ionization and other effects, the shorter the wavelength of the X-rays the greater the energy, called the hard X-rays, wavelength X-rays of lower energy, called soft X-rays. When in a vacuum, high-speed movement of the electron bombardment of the metal target, the target will release X-rays, which is the structure of the X-ray tube principle. X-rays emitted are divided into two categories: (1) if the target is blocked by the energy of the electrons, does not cross a certain limit, only the emission of a continuous spectrum of radiation. This radiation is called bremsstrahlung radiation; (2) a discontinuous, it is only a few special line-like spectrum, this emission line-like spectrum of radiation is called characteristic radiation. The nature of the continuous spectrum has nothing to do with the target material, while the characteristic spectrum is related to the target material, and different materials have different characteristic spectra, which is why it is called "characteristic". x-rays are characterized by very short wavelengths and high frequencies. Therefore, X-rays must be produced by atoms jumping between two energy levels with very different energies. So the X-ray spectrum is emitted when the innermost electrons in the atom jump, while the optical spectrum is emitted when the outer electrons jump. x-rays are not deflected in an electric magnetic field. This means that X-rays are a stream of uncharged particles.In 1906, it was experimentally demonstrated that X-rays are electromagnetic waves with a very short wavelength, and therefore can produce interference and diffraction.X-rays are used to help people with medical diagnosis and treatment; they are used for the examination of non-destructive materials in industry; and they have been used in both basic and applied sciences to analyze the structure of crystals and to carry out chemical analysis and atomic structure studies by means of X-ray spectroscopy and X-ray absorption. chemical analysis and atomic structure research through X-ray spectroscopy and X-ray absorption.
In the old days, the old technology was harmful to the human body. But now the technology will be more advanced than before, very small, in fact, now many things are harmful to the human body, take the things around you, cell phones, home appliances, and so on, are harmful to the body, so, life in these can not use? If the human body can really be harmful to the serious words, that now many things in society to be ignored.