Lead glass contains lead, which can effectively prevent radiation, so it is widely used in hospitals and other places with more radiation. Although lead glass contains lead oxide, its appearance is transparent. It's just a little yellow, but it's not obvious. Protective glass generally refers to X-ray or gamma ray or neutron proof glass. As the absorption capacity of materials to radioactive radiation increases with the increase of the atomic number of metal elements, the protective glass contains more heavy metal oxides. For example, X-ray resistant glass contains more PbO, Bao, etc., and gamma ray resistant glass contains more PbO, WO3, Bi2O3, etc. Because the penetrating ability of gamma ray is much stronger than that of X ray, the specific gravity and lead equivalent of gamma ray protective glass are much higher than that of X ray protective glass.
It's similar to ordinary glass. For the observation window of the radiology department of the hospital, our zf3 lead glass is used, and its lead content per millimeter is 0.22. However, for ZF6 or ZF7 of the nuclear power plant, due to its high lead content, its color is also dark yellow.
The main performance of lead glass is clear and transparent protection shield optically. A kind of low optical quality protection glass plate with specified attenuation performance is used, and its attenuation performance is 0.22mmpb per millimeter. When the coating was applied on the surface of medical lead glass, the metal surface was separated from the condition. This kind of maintenance effect can be called barrier effect.
After the general glass is irradiated by gamma ray, the glass is colored and the light transmittance decreases significantly. The degree of coloring is related to the composition and structure of the glass, and also to the radiation dose. This property of glass is called irradiation stability. The irradiation stability of high lead glass is poor, and the irradiation coloring effect is obvious. But after the irradiation stopped, the color could fade gradually after a period of time. If the glass is heated, the fading effect will be fast and the glass can be reused. In addition, in order to improve the irradiation stability of the glass, a small amount of CeO2 can be introduced into the glass. After irradiation, the transmittance of the glass decreases slightly.
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