Anti-radiation glass is a type of generalized optical glass. Including radiation-proof glass and radiation-resistant glass. Radiation-proof glass is mainly glass that has a large absorption capacity for gamma rays and X-rays. When γ-rays or X-rays enter the protective glass, the photoelectric effect is generated inside the glass, and positive and negative electron pairs are generated, and excited states and free-state electrons are generated at the same time, so that the injected γ-ray or X-ray energy is reduced, and the penetrating power is decreased. , played a protective role.
When the density of the radiation-proof glass increases, the shielding ability also increases accordingly. The density of the gamma-ray resistant glass is usually not less than 4.5 g/cm. In recent years, glass having a density of 6.2 to 6.5 g/cm has been used, and a ZF series is commonly used.
The radiation-resistant optical glass mainly refers to an optical glass which is not easily colored by the action of γ-rays. The name of the radiation-resistant optical glass grade is still based on the optical glass grade, indicating the number of radiation-resistant Roentgen. For example, the optical constant of K509 radiation-resistant optical glass is the same as K9, and it can withstand gamma rays of 10 Roentgen dose. Ordinary glass is irradiated with high-energy rays to generate free electrons, which combine with the absence of internal glass to form a color center. At the same time, the atomic nucleus can be displaced, the normal structure is destroyed, and the color center is generated to color the glass.
CeO2 is introduced into the radiation-resistant optical glass. After the high-energy gamma ray is irradiated, since the electrons can be trapped, the color center is not generated inside the glass, and the absorption bands of Ce and Ce are in the ultraviolet region. When the content of CeO2 is too high, the absorption bands in the ultraviolet and infrared rays extend to the visible light region, so that the absorption of the blue region of visible light increases, resulting in a yellow color of the glass. At the same time, the color will be deepened by the influence of other components in the glass, so the content of CeO2 should not be too high. The content of CeO2 in K509 is about 0.4% to 0.5%, and in K709, CeO2 is about 1%.
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