Corrosion Imaging and Thickness Determination Using Micro-Curie Radiation Sources Based on Gamma-Ray Backscattering: Experiments and MCNP Simulation
Publication: Publication Date: 1 February 2015
Gamma radiography is used to monitor the corrosion of pipelines in remote locations; usually high radioactivity (1011–1012 Bq) is used. The technique is also not useful for imaging pipes with thick walls or large vessel walls. In this work, Compton backscattered radiation was used for the wall-thickness determination and corrosion imaging of pipe and flat materials using extremely-low-activity sources with radioactivities on the order of 104–105 Bq. A two-dimensional scanning system was designed to scan object surfaces, and the signals from a NaI(Tl) scintillation detector were fed into a computer for image construction using the LabView program. Thicknesses greater than 1 cm and 1.5 cm could be measured for Fe and Al and for polyvinyl chloride (PVC) and poly methyl methacrylate (PMMA), respectively. It was also possible to detect changes of less than 1 mm in depression depth for depressions measuring 3 mm in diameter. One- and two-dimensional images artificial defects on a pipe surface were successfully constructed.
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