Definition: refers to the door with such as X ray, gamma ray and radiation function of special glass (in this kind of glass mostly using methyl methacrylate (MMA) glass), introduction of lead, barium, samarium and other metal elements to achieve its anti radiation performance.

Application: mainly used for occasions where radiation protection and radiation protection are needed. Such as in radiology, often used for radiation protection and shielding, or as a lead room for the observation window.

Radiation protection principle: electromagnetic wave X rays, gamma rays radiation belongs to the high energy, the rays in various media, the media can lead to atomic ionization phenomenon, which is also called ionizing radiation. The shorter the wavelength of an electromagnetic wave, the stronger its penetrating power. Since the wavelength of the ray is the same magnitude as the size of the atom, the molecular absorption coefficient can be summed up by the atomic absorption coefficient of each element of the constituent molecule. Therefore, the mass absorption coefficient of various oxides that make up glass can be calculated according to this principle. The composition of ordinary glass does not absorb this kind of radiation effectively. It is necessary to introduce a large number of atoms with high atomic number (such as lead and bismuth) into the glass composition to improve its absorption capacity. In addition, because the glass itself is absorbed in strong radiation, it is easy to become dark brown and lose transparency. Therefore, it is often necessary to have high radiation resistance of glass itself.