Abstract
Scattered radiation decreases the signal-to-noise ratio and the contrast of gamma-ray transmission tomography by introducing error in the measured tomography data and consequently error into the reconstruction algorithm. In order to minimize the effect of scattered radiation in multiple source gamma-ray tomographs, collimator blades are used in front of each detector. In the work presented here, the contribution and effect of scattered radiation emerging from multiple low-energy gamma-ray sources in the high-speed gamma-ray tomograph at the University of Bergen (UiB) are investigated. The scattered radiation has been determined experimentally using polypropylene phantoms to represent multiphase flow conditions. The results of these measurements are presented and a semi-empirical scatter correction model has been developed and successfully tested.
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