Accelerator Mass Spectrometry of 237Np, 239Pu and 240Pu for environmental studies at the Centro Nacional de Aceleradores
| Autor: | Mercedes López-Lora, Elena Chamizo |
|---|---|
| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Fundación Cámara Sevilla, Chamizo, Elena [0000-0001-8266-6129], Chamizo, Elena |
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Radionuclide 010504 meteorology & atmospheric sciences Isotope Nuclear engineering 010401 analytical chemistry Isotopic tracer 239 240Pu 237Np Natural uranium 01 natural sciences 0104 chemical sciences He stripper gas Reference sample Environmental science AMS non-isotopic normalization Seawater Instrumentation Compact AMS facilities Environmental studies 0105 earth and related environmental sciences Accelerator mass spectrometry |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Low-energy Accelerator Mass Spectrometry (AMS) systems (i.e. working with 1 MV terminal voltages and below) have demonstrated in the past their capability for the ultra-trace analyses of U and Pu in different field studies. The situation for Np has been different, mostly due to the constraints imposed by the lack of a Np isotopic tracer. Here, it is presented a comprehensive study on the performance of the 1 MV AMS system at the Centro Nacional de Aceleradores (CNA) for: i) the determination of Np using Pu as the AMS normalisation isotope and, ii) the efficient analysis of Pu, Pu and Np when they coexist in the same cathode with traces of natural uranium. Working procedures to analyse Np and Pu on one hand, and Pu on the other, are developed in order to meet competitive U suppression factors and counting efficiencies for every radionuclide. It is demonstrated that the sputtering-process-based temporal trend in the Np/Pu AMS ratios show a coherent behaviour between the different studied matrixes, demonstrating the reliability of the necessary standard correction procedure in AMS. It is proved that Np and Pu concentrations at the 1 fg level and Pu concentrations at the 0.1 fg level can be quantified in samples containing U traces. The technique is applied to the Pu and Np analysis of a seawater reference sample supplied by the International Atomic Energy Agency (IAEA): IAEA-443. This work has been financed from the project FIS2015-69673-P, provided by the Spanish Ministry of Economy. This work was partially funded by Fundación Cámara Sevilla through a Grant for Graduate Studies. |
| Databáze: | OpenAIRE |
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