几种建筑材料的氡射气系数研究

通过天然γ能谱测量方法测定建材样品中的镭含量,计算理论上衰变产生的氡密度,以及用硫化锌闪烁法测定由样品释放到空气中的氡密度的方法来计算氡的射气系数。通过改变样品的颗粒度大小,以及改变样品的灼烧温度等条件,来研究氡射气系数的变化规律。结果表明,土坯砖射气系数在8.5%~29.4%,红砖射气系数在0.031%~3.5%之间,瓷砖射气系数在0.74%~4.5%之间;建筑材料的氡射气系数随着其自身颗粒度的增大而减小,随加工(灼烧)温度升高而减小。

Research on Separating Out Rate of Rn of Construction Materials

The separating out rate of radon was figured by the content of radium in the samples of construction material,through the mensuration of natural radioactivity and by measuring the density of radon that is released by the samples through ZnS sparking method.The variation rule of the separating out rate of radon was investigated by changing the samples' size of grain and by burning the samples under different temperatures.The results show that as to the same samples,when other situation is alike,the bigger the size of grain is,the smaller the separating out rate of radon is;and the higher the temperature is,the smaller the separating out rate of radon is.