X射线防护玻璃的结构效应

Structural effect of X-ray protection glass

在Ｋ２Ｏ（Ｎａ２Ｏ）－ＰｂＯ（ＴｉＯ２）－ＳｉＯ２（Ａｌ２Ｏ３）系统中，防辐射玻璃是采用常规熔融方法制备的。该玻璃对Ｘ射线的防护能力可以用Ｃｏ６０－γ源检测。通过对玻璃的折射率、密度、显微硬度及线膨胀系数的测定研究，结果表明，玻璃的防Ｘ射线能力不仅取决于玻璃的密度及组分的质量吸收系数，而且与玻璃的结构特征有关。根据实验结果，我们提出了玻璃组成和结构对玻璃防Ｘ射线能力的综合效应的观点。玻璃结构紧密，能降低玻璃中高能粒子的运动速度，有利于玻璃对辐射粒子的吸收。我们将这种结构效应称为“韧滞效应”。

Radiation protection glass in K2O (Na2O)-PbO (TiO2)-SiO2 (Al2O3) system was prepared by the conventional glass melting method. High-energy radiation protection ability of this glass was measured by Co60-γ source. The refractive index, density, micro-hardness and linear expansion coefficient were measured by correspoinding method. Results indicate the ability of radiation protection of glass is not only decieded by the density and the mass absorption coefficient of glass but also related with the structural characteristic. According to the experimental results, the point of view of synthetical effects of glass composition and glass structure on radiation protection ability was put forward. The tight structure decreases the transmission velocity of radiation and benefit the absorption of radiation.The structural effect is defined as Tougten retardation effect.