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dc.contributor.author
Cid, A. S.
dc.contributor.author
Anjos, R. M.
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Zamboni, C. B.
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Cardoso, R.
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Muniz, M.
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Corona, A.
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Valladares, Diego Leonardo
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Kovacs, L.
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Macario, K.
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Perea, D.
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Goso, C.
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Velasco, Ricardo Hugo
dc.date.available
2016-05-23T20:32:24Z
dc.date.issued
2014-06-20
dc.identifier.citation
Cid, A. S.; Anjos, R. M.; Zamboni, C. B.; Cardoso, R.; Muniz, M.; et al.; Na, K, Ca, Mg, and U-series in fossil bone and the proposal of a radial diffusion?adsorption model of uranium uptake; Elsevier; Journal of Environmental Radioactivity; 136; 20-6-2014; 131-139
dc.identifier.issn
0265-931X
dc.identifier.uri
http://hdl.handle.net/11336/5799
dc.description.abstract
Fossil bones are often the only materials available for chronological reconstruction of important archeological sites. However, since bone is an open system for uranium, it cannot be dated directly and therefore it is necessary to develop models for the U uptake. Hence, a radial diffusion–adsorption (RDA) model is described. Unlike the classic diffusion–adsorption (D–A) model, RDA uses a cylindrical geometry to describe the U uptake in fossil bones. The model was applied across a transverse section of a tibia of an extinct megamammal Macrauchenia patachonica from the La Paz Local Fauna, Montevideo State, Uruguay. Measurements of spatial distribution of Na, K, Ca, and Mg were also performed by neutron activation analysis (NAA). Gamma-ray spectrometric U-series dating was applied to determine the age of the bone sample. From U concentration profile, it was possible to observe the occurrence of a relatively slow and continuous uranium uptake under constant conditions that had not yet reached equilibrium, since the uranium distribution is a ∪-shaped closed-system. Predictions of the RDA model were obtained for a specific geochemical scenario, indicating that the effective diffusion coefficient D/R in this fossil bone is (2.4 ± 0.6)10−12 cm2s−1. Mean values of Na, K, Ca, and Mg contents along the radial line of the fossil tibia are consistent with the expected behavior for spatial distributions of these mineral elements across a modern bone section. This result indicates that the fossil tibia may have its mineral structure preserved.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Rda
dc.subject
U-Uptake
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Macrauchenia-Patachonica
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Ciencias Medioambientales
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Na, K, Ca, Mg, and U-series in fossil bone and the proposal of a radial diffusion?adsorption model of uranium uptake
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-05-16T20:08:30Z
dc.journal.volume
136
dc.journal.pagination
131-139
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Cid, A. S.. Universidade Federal Fluminense. Instituto de Física. Laboratorio de Radioecologia e Alteraçoes Ambientais; Brasil
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Fil: Anjos, R. M.. Universidade Federal Fluminense. Instituto de Física. Laboratorio de Radioecologia e Alteraçoes Ambientais; Brasil
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Fil: Zamboni, C. B.. Centro do Reator de Pesquisa. Instituto de Pesquisas Energ eticas e Nucleares; Brasil
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Fil: Cardoso, R.. Universidade Federal Fluminense. Instituto de Física. Laboratorio de Radioecologia e Alteraçoes Ambientais; Brasil
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Fil: Muniz, M.. Universidade Federal Fluminense. Instituto de Física. Laboratorio de Radioecologia e Alteraçoes Ambientais; Brasil
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Fil: Corona, A.. Universidad de la Republica. Facultad de Química y Facultad de Ciencias; Uruguay
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Fil: Valladares, Diego Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Matemática Aplicada de San Luis; Argentina
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Fil: Kovacs, L.. Centro do Reator de Pesquisa. Instituto de Pesquisas Energ eticas e Nucleares; Brasil
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Fil: Macario, K. . Universidade Federal Fluminense. Instituto de Física. Laboratorio de Radioecologia e Alteraçoes Ambientais; Brasil
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Fil: Perea, D.. Universidad de la Republica. Facultad de Química y Facultad de Ciencias; Uruguay
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Fil: Goso, C.. Universidad de la Republica. Facultad de Química y Facultad de Ciencias; Uruguay
dc.description.fil
Fil: Velasco, Ricardo Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Matemática Aplicada de San Luis; Argentina
dc.journal.title
Journal of Environmental Radioactivity
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0265931X14001581
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jenvrad.2014.05.018
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jenvrad.2014.05.018
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