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dc.creatorMantero Cabrera, Juanes
dc.creatorAbril Hernández, José Maríaes
dc.creatorGarcía-Tenorio García-Balmaseda, Rafaeles
dc.creatorKlubi, Emmanueles
dc.creatorNyarko, Elvises
dc.identifier.citationMantero Cabrera, J., Abril Hernández, J.M., García Tenorio, R., Klubi, E. y Nyarko, E. (2019). Experimental study on the use of granulometric speciation for the radiometric dating of recent sediments. Journal of Environmental Radioactivity, 208-209 (November 2019, art. nº106016), 1-10.
dc.description.abstractTheoretical and experimental studies have shown that activity concentrations of fallout radionuclides (such as 137Cs and excess 210Pb) decrease with particles size in aqueous suspensions. This paper is aimed at reviewing the theoretical fundamentals for granulometric speciation of radionuclides, and at exploring its practical use in the analytical context of gamma spectrometry for the radiometric dating of recent sediments, with view to: i) improving the detection of 137Cs (since its use as independent chronostratigraphic mark is challenging in the southern hemisphere because its low fallout rate), ii) supporting refined CIC models and normalization techniques in 210Pb-based radiogeochronologies. The work uses surface sediments sampled from the Tinto Estuary (SW Spain), affected by mining and phosphate-fertilizer industries, and from the Ankobra Estuary (Ghana), affected by intensive artisanal gold-mining. Granulometric classes have been separated by a sieving column with decreasing mesh sizes and the obtained cumulative percentage of mass mathematically described by a Rosin-Rammler particle-size distribution. The target radionuclides for gamma spectrometry were 210Pb, 226Ra and137Cs, complemented with 40K, 234Th and 228Ra. Results revealed that, far from ideal experiments, under actual environmental conditions the increase in activity concentrations with decreasing particle sizes is too moderate, and in general they are affected by larger counting uncertainties due to the small available amount of mass. Indeed, there was no correlation between grain-size and 137Cs concentrations (p = 0.25), and similarly for excess 210Pb (p = 0.53). No effect of the organic matter content was observed in 137Cs (p = 0.58) and excess 210Pb (p = 0.85) concentrations. Present results pose some concerns to the general use of granulometric speciation in the context of gamma spectrometry for supporting the radiometric dating of recent sediments. A detailed discussion on the use of normalization methods is also
dc.description.sponsorshipInternational Atomic Energy Agency Research Project RAF7009es
dc.relation.ispartofJournal of Environmental Radioactivity, 208-209 (November 2019, art. nº106016), 1-10.
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.subjectRadiometric datinges
dc.subjectGranulometric speciationes
dc.subjectGamma spectrometryes
dc.subjectDetection limites
dc.subjectNormalized activitieses
dc.titleExperimental study on the use of granulometric speciation for the radiometric dating of recent sedimentses
dc.contributor.affiliationUniversidad de Sevilla. Departamento de Física Aplicada Ies
dc.contributor.affiliationUniversidad de Sevilla. Departamento de Física Aplicada IIes
dc.contributor.groupUniversidad de Sevilla. RNM-138: Física Nuclear Aplicadaes
dc.journaltitleJournal of Environmental Radioactivityes
dc.publication.issueNovember 2019, art. nº106016es
dc.contributor.funderInternational Atomic Energy Agency (IAEA)es

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