Simulation of Void Detection System using Gamma-Ray Compton Scattering Technique

Mona Berlian Sari, Rahadi Wirawan, Abdul Waris, Hong Joo Kim, Mitra Djamal

Abstract


A simple void detection system for concrete was successfully developed using high-penetration gamma rays with Compton scattering. This research attempted to identify a void in the subsurface of a concrete volume that could not be accessed from any of the sides. Monte Carlo simulation using GEANT4 toolkit was performed to investigate the gamma-ray backscattering events. An NaI(Tl) detector was used with 60Co and 137Cs as gamma-ray sources. The void’s location was successfully detected during material target scanning. Density discrepancies conduce variance of the backscattering peak produced due to the presence of a void. Compared to 60Co as the gamma-ray source, 137Cs is a better choice for application in NDT systems using Compton scattering.

Keywords


GEANT4, backscattering, detector, gamma-ray, non-destructive testing.

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References


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DOI: http://dx.doi.org/10.5614%2Fj.eng.technol.sci.2019.51.3.5

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