Abstract
A non-collimated gamma spectroscopy with fewer sampling (counting) and shorter sampling periods is developed and used to estimate the concentration profile of the radiotracers within the column. In this method, the radiotracer activity in the whole column is measured in a few different positions of the detector and then, by using an appropriate advection-dispersion model and the genetic algorithm, the concentration profile within the column is constructed. The concentration profile obtained by the new method fits very well to the experimentally obtained thin-section scanning results with RMSE less than 0.046. The uniqueness of the concentration profile obtained by the method was confirmed by a sensitivity analysis. Beside the excellent prediction of the concentration profile, the non-collimated gamma spectroscopy (our method) is much faster than the conventional thin-section gamma scanning method. In our experimental set-up, it took less than 10 min to construct the concentration profile by the non-collimated gamma spectroscopy, much less than 8 h required for thin-section scanning method.
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