Application of gamma ray scattering technique for non-destructive evaluation of voids in concrete

This paper describes application of the gamma ray scattering technique for NDE of concrete voids. A novel nonlinear extrapolation method is employed to correct for self-absorption and multiple scattered intensities. The attenuation data obtained from transmission method is employed for reconstruction of scattered images and the results show a good agreement in size and position of the voids with good spatial resolution. Intercomparison of the results of scattering and transmission techniques shows a good agreement in the position of the voids.

► Improved gamma scattering technique for NDE of voids in concrete.
► A unique algorithm to calculate the path length in each scattering voxel.
► A novel attenuation correction and density reconstruction method.
► Three dimensional images of the concrete samples with voids reconstructed.