Features of X-ray Absorption Densitometry of Large-size Objects with Variable Thickness

3rd All-Russian Scientific and Practical Conference on Innovations in Non-Destructive Testing

Osipov, S.^1 ; Chakhlov, S.^1 ; Osipov, O.^1 ; Badin, S.^1 ; Abashkin, A.^1

NDT Institute, Tomsk Polytechnic University, Russia^1

关键词: Analog-digital converter;    Digital radiography;    Equation coefficients;    Experimental estimations;    Homogeneous objects;    Radiometric signals;    Scattered radiations;    Thickness dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/671/1/012043/pdf
DOI  :  10.1088/1742-6596/671/1/012043

来源: IOP

【 摘 要 】

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/cm3for the steel ware thickness from 25 to 100 mm.