用双能X射线测量双组分物质的质量厚度

Mass thickness measurement of dual-sample by dual-energy X-rays

通过加吸收片的方法,获得样品在给定高压下的X射线等效能量,可用来测量该样品的质量厚度。本文讨论了测量双组分样品质量厚度的方法,发现在实验的双组分样品厚度范围内,用单组分样品的等效质量衰减系数代替双组分样品中该组分的质量衰减系数来计算双组分样品的质量厚度,具备可行性,测量结果的误差在5%以内。测量实物鱼体,求解出鱼体的软组织和骨组织的质量厚度,进一步证明在双组分样片厚度不大的情况下,这种测量方法的现实可行性。

X-ray equivalent energy can be used to measure mass thicknesses of materials. Based on this, a method of mass thickness measurement of dual-sample was discussed. It was found that in the range of sample mass thickness under investigation, the equivalent mass attenuation coefficient of a component could be used to compute mass thicknesses of a dual-sample, with relative errors of less than 5%. Mass thickness measurement of a fish sample was performed, and the fish bone and flesh could be displayed separately and clearly by their own mass thicknesses. This indicates that the method is effective in mass thickness measurement of dual-sample of suitable thicknesses.