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Influence of radionuclide adsorption on detection efficiency and energy resolution for flow-cell radiation detectors

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3 Author(s)
DeVol, T.A. ; Clemson Univ., SC, USA ; Keillor, M.E. ; Burggraf, L.W.

Flow-cell and batch test experiments were performed to determine the uranyl ion adsorption onto and/or complexation with CaF2:Eu scintillator as a function of pH. The flow-cell experiments were modeled with an energy dispersive Monte Carlo algorithm. At pH 2, the flow-cell and batch tests gave consistent results, detection efficiency ~60% and distribution coefficient (Kd ) ~0.3-0.7 mL/g, with the model. At pH 8, the comparison was not as good and assumed to be due to variation in scintillator particle size realized in the experiment. From the flow-cell experiments performed at pH 8, the detection efficiency was determined to be 68% which correlated reasonably well with the model (60%). Where the experiments and model differed greatly was with Kd which was determined to be 102 and 60 for the flow-cell and batch experiments, respectively, and 0.43 from the model

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Nuclear Science, IEEE Transactions on  (Volume:43 ,  Issue: 3 )