γ射线双源双能法测量土样湿度密度的质量吸收系数与精度分析

On the mass absorption coefficient in measuring water content and bulk density by using dual γ rays and its accuracy

介绍了用γ射线双源双能法同时测定土样密度和含水量的技术,其中质量吸收系数的合理标定是测量工作的基础。在提出合理的质量吸收系数的标定方法的基础上,分析了影响测量精度的因素,对提高γ射线双源双能法测量土样密度和含水量的精度,并将其应用于非饱和土三轴试验,为研究土样在力和水的共同作用下的力学性状提供了测定手段。

A rational method for calibrating the mass absorption coefficient in measuring soil water content and bulk density with dual γrays was introduced,and the factors affecting the measurement accuracy were analyzed.Improvement was achieved on the accuracy of measurement of soil water content and bulk density,which makes it possible to apply the measuring system to triaxial apparatus for unsaturated soil test to reveal characteristics of unsaturated soils under force and water infiltration.