Quality Assessment of Gypsum Structure Using Tomography Method (Modeling and Experimental)

In this study, the quality measurement of a plaster structure armed with steel rods and an internal air cavity was carried out. The scanner system is equipped with a cesium-137 gamma radioactive source with 661.7 keV photopeak energy and a linear array CdWO4 scintillating crystal of detector with 8 x 8 mm2 pixel size. The analysis of the internal structure of the sample was performed in two simulation and experimental phases. MCNPX Monte Carlo code was used to perform the simulation phase.  MLEM and Back Projection methods were used to reconstruct the images. The simulation results were compared with the experimental outputs, their performance in the 3D display inside this phantom was investigated. The results showed that the MLEM reconstruction method is more efficient than the back projection reconstruction method both in the simulation phase and in the experimental phase in providing internal images. The results showed that with modeling, it is possible to evaluate the tomographical pictures of the manufactured samples, and before setting the experimental, it can be used for different materials and geometries.