Features of X-ray Absorption Densitometry of Large-size Objects with Variable Thickness
Features of X-ray Absorption Densitometry of Large-size Objects with Variable Thickness
复制标题
大尺寸变厚度物体X射线吸收密度测定的特点
DOI：
10.1088/1742-6596/671/1/012043
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
A. Abashkin
中科院分区：
文献类型：
--
作者：
S. Osipov;S. Chakhlov;O. Osipov;S. Badin;A. Abashkin
本文研究了数字式高能X射线吸收密度计测量变厚度均匀物体时，一次辐射信号的形成和处理特点。提出了基于物体射线厚度与其质量厚度关系的多项式近似的密度计方程。给出了模数转换器容量选择的指导原则。并给出了一个密度计方程系数计算的实例，用于检测质量密度为15 ~ 80 g/cm ~ 2的碳、铝、钢制品。结果表明，不一致的实验和估计值的射线厚度为类似的质量厚度的测试对象是由散射辐射的条件。在高能数字X射线摄影机上，采用电子感应加速器MIB-4.5/9，对厚度为25 ~ 100 mm的钢件，密度的实验估算精度在0.0086 g/cm ~ 3以内。
Features of formation and processing of the primary radiometric signals in the digital high-energy X-ray absorption densitometers for the homogeneous objects with variable thickness are examined. The densitometer's equation based on the polynomial approximation of the object's ray thickness dependence from its mass thickness is proposed. Guidance to select the capacity of the analog-digital converter is given. There is one example of the densitometer's equation coefficients calculation to examine the carbon, aluminum and steel wares with the mass density from 15 to 80 g/cm2. It was shown that disagreement of the experimental and estimated values of the ray thickness for the similar mass thicknesses of the testing object is conditioned by the scattered radiation. On the high-energy digital radiography set with the X-ray source - the betatron MIB-4.5/9 the accuracy of the experimental estimation of the density was within 0.0086 g/cm3 for the steel ware thickness from 25 to 100 mm.