Tomography is a technique in order to display a representation of a cross-section through solid objects using x-rays, gamma rays or ultrasound waves. The purpose of this paper is to provide a non-invasive technique for creating a CT image and detecting air holes in a concrete structure using gamma-ray tomography technique. In this work, the concrete column with a cross-section of 40 cm × 40 cm and a length of 3 meters was considered as the desired structure. There were two air holes in the concrete column. Also, the isotope Cs-137 was considered as a radioactive source. One NaI(Tl) scintillation detector was used in order to measure the rate of gamma-rays emitted by the radioactive source. This structure was simulated using the MCNPX code. Then, the image of the cross-section was reconstructed using the obtained data of MCNPX, MATLAB software, and the ART algorithm. In the ART method, it was assumed that the cross-section contains unknown pixels. A row matrix (1 × n) and a column matrix (n × 1), which are the sum of the row pixels and column pixels of the image were defined as input for ART algorithm. The output was a matrix (n × n) that matrix arrays (n × n) are cross-section image pixels. Therefore, using these arrays, the cross-sectional image was reconstructed. The reconstructed image showed the correct location of the air holes. According to the obtained results, the proposed gamma radiation tomography technique was an appropriate and non-invasive technique in order to a cross-sectional analysis of concrete structures.
M. Safavi, H. Jafari, A. Kamali Asl, M. Shahriyari "Design and manipulation 3d imaging system by using photodiode grid", Iranian Journal Of Medical Physics, P.P.53-64.
“Industrial Process Gamma Tomography”, Final report of a coordinated research project 2003-2007, International Atomic Energy Agency, May 2008.
de Oliveira Jr, J. M. Martins, A. C. G. DE Milito, J. A. “Analysis of Concrete Material through Gamma Ray Computerized Tomography”, Brazilian Journal of Physics, vol.23, (2004).
M. Akbari, "Resolution and contrast quantitative analysis in images of computer cross sections using MTF curve calculation", a thesis submitted for the degree of master of science, Department of Nuclear Engineering, Shahid Beheshti University, (2009).
M, Safavi, "Design and manufacture of 3D miniature CT scanning device under the control of MATLAB software with the ability to form and process three the next", a thesis submitted for the degree of master of science, Department of Nuclear Engineering, Shahid Beheshti University, (2009).
Smith, S. W. “The Scientist and Engineer’s Guide to Digital Signal Processing”, California Technical Publishing, Second Edition, 1997-1999.
Sharifi, M. Young, B. “3-Dimensional spatial monitoring of tanks for the milk processing industry using electrical resistance tomography”, Journal of Food Engineering, 105, 312-319 (2001).
Sharifi, M. B. Young, W. Yu. “Towards fault detection of the operation of dairy processing industry tanks using Electrical Resistance Tomography”, Food Control, 38, p.p.192-197 (2014).
Angel, J. De Chiffre, L. “ Comparison on Computed Tomography using industrial items”, CIRP Annals – Manufacturing Technology, 63, p.p.473-476 (2014).
Mesquita, C.H. de Velo, A.F. Carvalho, D.V.S Martins, J. F. T. Hamada, M. M. “Industrial tomography using three different gamma ray Energies Simultaneously- IMAGE Analysis”, Flow Measurement and Instrumentation, 74, p.p.1-9 (2016).
Polansky, J. Wang, M. “Proper Orthogonal Decomposition as a technique for identifying two-phase flow pattern based on electrical impedance tomography”, Flow Measurement and Instrumentation, 53, Part A, p.p.126-132 (2016).
Taylor, S. H. Garimella, S. V. “Design of electrode arrays for 3D capacitance tomography in a planar domain”, International Journal of Heat and Mass Transfer, 106, p.p.1251-1260 (2017).
Yenumula, L. Acharya, R. V. Kumar, U. Selvam, T. P. Roy, K. Patankar, V.H. Kar, S. “Ring artifact correction in gamma-ray process tomography imaging”, Applied Radiation and Isotopes, 124, p.p.75-82 (2017).
Shikhaliev, P. M. “Computed Tomography imaging of large cargos”, 2018.
MCNPXTM USER’S MANUAL, Version 2.5.0, 2005.
Roshani, G.H. Hanus, R. Khazaei, A. Zych, M. E. Nazemi, Mosorov, V. “Density and velocity determination for single-phase flow based on radiotracer technique and neural networks”, Flow Measurement and Instrumentation, 61, p.p.9-14 (2017).
Roshani, G.H. Karami, A. Khazaei, A. Olfateh, A. Nazemi, E. Omidi, M. “ optimization of radioactive sources to achieve the highest precision in threephase flow meters using Jaya algorithm”, Applied Radiation and Isotopes, 139, p.p.256-265 (2018).
M. Zych, R. Hanus, Petryka, L. Swisulski, D. Strzepowicz, A., Zych, P., “Application of gamma densitometry and statistical signal analysis to gas phase velocity measurements in pipeline hydrotransport”, Conference Paper in The European Physical Journal Conferences, November (2014)
Mosorov, V. Zych, M. Hanus, R. Petryka, L. “Modelling of dynamic experiments in MCNP5 environment”, Applied Radiation and Isotopes, 112, p.p.136-140 (2016).
E. Nazemi, S.A.H. Feghhi, G.H. Roshani, S. Setayeshi, R. Gholipour Peyvandi, “A radiation-based hydrocarbon two-phase flow meter for estimating of phase fraction independent of liquid phase density in stratified regime”, Flow Measurement and Instrumentation,46, 25–32 (2015).
Oliveira, E. F. Melo, S. B. Dantas, C. C. D. Vasconcelos, A. A. Cadiz, L. F. “ comparison among tomographic reconstruction algorithms with a limited data”, International Nuclear Atlantic Conference, (2011).
Khazaei, A., Shahrokhi, E., & Roshani, G. H. (2020). Detecting Air Holes in a Concrete Structure Using Gamma-Ray Tomography Technique. Amirkabir Journal of Civil Engineering, 52(1), 213-224. doi: 10.22060/ceej.2018.14712.5724
Arezoo Khazaei; Elham Shahrokhi; Gholam Hossein Roshani. "Detecting Air Holes in a Concrete Structure Using Gamma-Ray Tomography Technique". Amirkabir Journal of Civil Engineering, 52, 1, 2020, 213-224. doi: 10.22060/ceej.2018.14712.5724
Khazaei, A., Shahrokhi, E., Roshani, G. H. (2020). 'Detecting Air Holes in a Concrete Structure Using Gamma-Ray Tomography Technique', Amirkabir Journal of Civil Engineering, 52(1), pp. 213-224. doi: 10.22060/ceej.2018.14712.5724
Khazaei, A., Shahrokhi, E., Roshani, G. H. Detecting Air Holes in a Concrete Structure Using Gamma-Ray Tomography Technique. Amirkabir Journal of Civil Engineering, 2020; 52(1): 213-224. doi: 10.22060/ceej.2018.14712.5724