A new method for the direct measurement of 237 Np/ 238 U ratio in irradiated UO 2 pellets by multicollection inductively coupled plasma mass spectrometry (MC-ICP-MS) is proposed. It allows the determination of ratios down to 10 × 10 –6 mol·mol −1 using ion counter and Faraday cup. This approach was validated by intercomparison with the usual two-step-method (Quadrupole ICP-MS for 237 Np determination and isotope dilution mass spectrometry (IDMS) for 238 U). For ratios between 10 × 10 –6 and 100 × 10 –6 mol·mol −1 , expanded uncertainties ( k = 2) varied from 2.75% to 0.81%, twice lower than the uncertainties determined by the usual method.
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Mialle et al. (2024) studied this question.
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