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As applied to distillation columns, gamma scanning uses a small, sealed radiation source and a sensitive detector aligned on opposite sides of the column. The scanning apparatus is kept on the outside surface of the process equipment, so the procedure is completely non-invasive and non-interactive to the normal operation of the process.
Based on the fundamentals of radiation, the radiation intensity passing through a material decreases exponentially as a function of the material density. Or stated differently, an increase in material density or thickness results ray transmission through a distillation column is affected by the column internals, the process fluids, and by external...