Factors related to 41K interference on 41Ca AMS measurements
| Autor: | J. M. López-Gutiérrez, C. Vivo-Vilches, Manuel García-León, Christof Vockenhuber |
|---|---|
| Přispěvatelé: | Universidad de Sevilla. Departamento de Física Aplicada I, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Economía y Competitividad (MINECO). España, Ministerio de Economía y Competitividad (España), Vivo-Vilches, C. [0000-0002-4972-4072], López-Gutiérrez, J. M. [0000-0001-8672-8075], García-León, Manuel [0000-0002-8792-6791], Vivo-Vilches, C., López-Gutiérrez, J. M., García-León, Manuel |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Nuclear and High Energy Physics Sequence Accuracy and precision Fortran Accelerator mass spectrometry Interference (wave propagation) Blank 41Ca Computational physics K correction Ion 41K interference K-correction Accelerator Mass Spectrometry Instrumentation computer computer.programming_language |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2018.04.031 |
| Popis: | Dealing with the 41K interference during 41Ca measurement with low energy AMS systems is challenging. The detection of 39K to correct the measured 41Ca/40Ca ratios is a powerful tool that improves precision and accuracy. However, the study of the sources of this interference can help to reduce it to its minimum. In this work, it is shown that iron is a factor enhancing the production of the 41K interference, since the (41K57Fe)− ion has the same mass as (41K19F3)−. To validate this observation, we measured 57Fe2+ together with 41M2+ (all ions with mass 41) and 39K2+ in a blank sample and an aluminum target at the 600 kV AMS system at ETH Zurich. We also show the temporal evolution of 41M/40Ca and 39K/40Ca ratios in two blank samples during a measurement on the 1 MV AMS system at CNA Seville. Even when unstable behavior for these ratios is observed for one of the blanks, the relationship between both, 41M/39K, is relatively stable over time. This supports the accuracy of the K–correction method, providing that it is applied sequence by sequence. Two programs, one for each of these compact AMS systems, were written in FORTRAN code to deal with the complexity of the data analysis due to the K-correction. This work has been financed through the projects FIS2012-31853 and FIS2015-69673-P provided by the Spanish Ministry of Economy and Competitiveness. |
| Databáze: | OpenAIRE |
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