Portable gamma-ray tomography instrumentation for investigating corrosion under insulation of pipelines

• Main Authors: Susiapan, Yvette Shaan-Li, Abdul Rahim, Ruzairi, Pusppanathan, Jaysuman, Mohd. Zain, Rasif
• Format: Book Section
• Published: World Scientific And Engineering Acad And Soc 2009
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/13061/
• Institution: Universiti Teknologi Malaysia

The objective of this research endeavor is to develop a Portable Gamma-ray Tomography Instrumentation for investigating corrosion under insulation of pipelines. Gamma ray densitometry is a non- destructive method for determining the density. The principle of gamma ray tomography measurement is based on the absorption of gamma radiation in the tested material. The scanning is performed using a small radioactive source and a sensitive electronic detector. The source and detector are kept external to the pipe and positioned on opposite sides at a fixed distance apart. Gamma rays travel from the source through the pipe to the detector where they are counted. The research covers the hardware design, implementation of measurement electronics as well as the software to receive the intensity counts, convert and display a tomographic image that corresponds correctly to the pipe condition of the pipe being scanned. The research concentrates on pipe condition and not the flow in the pipe. The collected data in the form of intensity is converted to a suitable signal and input in offline mode to produce a tomogram.