Abstract
In the analysis of rare earth elements in samples containing uranium by k 0-neutron activation analysis fission of 235U was considered an undesired phenomenon until the “fission k 0-factors” were introduced to account for natural-U fission interferences. In this work, by using a reverse perspective of the problem, the observed 235U-fission and 238U activation products (along with the k 0-factors) were used to obtain information about the n( 235U)/ n( 238U) 1 1 Definition: n(X) refers to the isotopic abundance of isotope X isotopic ratio in the samples. The relevant formulae and data-filtering algorithm were implemented in a home-made computer software, allowing automated evaluation and selection of unbiased data. Two radioisotopes ( 131I and 140La) were demonstrated to be reliable candidates for n( 235U)/ n( 238U) determination in environmental samples. The accuracy of this method was determined using several isotopic standards varying from a depleted to a highly enriched 235U content. An overall 2.31±0.03% overestimation of the isotopic ratio was observed (within 95% confidence level).
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