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首页> 外文会议>INMM annual meeting >REDUCTION OF MEASUREMENT UNCERTAINTY IN THE SPECTROSCOPIC DETERMINATION OF URANIUM
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REDUCTION OF MEASUREMENT UNCERTAINTY IN THE SPECTROSCOPIC DETERMINATION OF URANIUM

机译：光谱法测定铀时测量不确定度的降低

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Optical absorbance spectroscopy techniques show significant promise for the rapid determination of uranium concentrations in process streams for the recycling of nuclear fuel. However, the measurement of uranium absorption is highly dependent on the nitrate concentration in the process stream due to changes in speciation. Current procedures which rely on calibrations at expected process concentrations insert an additional systemic bias due to the variation of nitrate concentrations from the matrix used to calibrate the system. To reduce this systemic bias, a technique has been developed to simultaneously determine the nitrate and uranium concentrations in the process stream. By correcting the measured uranium concentration to account for the difference in speciation due to the nitrate concentration, the overall measurement uncertainty for uranium in the process stream is reduced. The systemic bias introduced by the changing nitrate concentration in the process stream is also effectively removed from the measurement.
机译：光学吸收光谱技术显示了快速测定循环核燃料循环中铀浓度的重要前景。但是，由于形态的变化，铀吸收的测量高度依赖于工艺物流中的硝酸盐浓度。当前方法依赖于预期过程浓度下的校准，由于用于校准系统的基质中硝酸盐浓度的变化，导致了额外的系统偏差。为了减少这种系统性偏差，已经开发了一种同时测定工艺物流中硝酸盐和铀浓度的技术。通过校正测得的铀浓度以解决由于硝酸盐浓度引起的形态差异，可以减少工艺流中铀的总体测量不确定度。工艺流中硝酸盐浓度变化引起的系统偏差也可以从测量中有效消除。

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