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Herein, we describe an improved procedure for 238Pu, 240Pu, 241Am, and natural U quantitation in fecal samples and validate it by analyzing reference samples of the intercomparison program. Interference caused by 237Np resulted in Pu content underestimation, which was corrected by the addition of an alternative tracer. Samples processed using the fusion method (to facilitate dissolution) exhibited...
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